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139440840 = 233571115091
BaseRepresentation
bin10000100111110…
…11001011001000
3100201101022212120
420103323023020
5241144101330
621500411240
73312141030
oct1023731310
9321338776
10139440840
117178aa70
123a846b20
1322b72996
141473a8c0
15c395c10
hex84fb2c8

139440840 has 128 divisors (see below), whose sum is σ = 521579520. Its totient is φ = 28972800.

The previous prime is 139440823. The next prime is 139440853. The reversal of 139440840 is 48044931.

It is a happy number.

139440840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1695 + ... + 16785.

It is an arithmetic number, because the mean of its divisors is an integer number (4074840).

Almost surely, 2139440840 is an apocalyptic number.

139440840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139440840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260789760).

139440840 is an abundant number, since it is smaller than the sum of its proper divisors (382138680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139440840 is a wasteful number, since it uses less digits than its factorization.

139440840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15123 (or 15119 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 139440840 is about 11808.5071029322. The cubic root of 139440840 is about 518.5571937466.

The spelling of 139440840 in words is "one hundred thirty-nine million, four hundred forty thousand, eight hundred forty".

Divisors: 1 2 3 4 5 6 7 8 10 11 12 14 15 20 21 22 24 28 30 33 35 40 42 44 55 56 60 66 70 77 84 88 105 110 120 132 140 154 165 168 210 220 231 264 280 308 330 385 420 440 462 616 660 770 840 924 1155 1320 1540 1848 2310 3080 4620 9240 15091 30182 45273 60364 75455 90546 105637 120728 150910 166001 181092 211274 226365 301820 316911 332002 362184 422548 452730 498003 528185 603640 633822 664004 830005 845096 905460 996006 1056370 1162007 1267644 1328008 1584555 1660010 1810920 1992012 2112740 2324014 2490015 2535288 3169110 3320020 3486021 3984024 4225480 4648028 4980030 5810035 6338220 6640040 6972042 9296056 9960060 11620070 12676440 13944084 17430105 19920120 23240140 27888168 34860210 46480280 69720420 139440840