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1389420 = 223353183
BaseRepresentation
bin101010011001101101100
32121120221000
411103031230
5323430140
645440300
714544534
oct5231554
92546830
101389420
1186998a
12570090
13398556
142824c4
151c6a30
hex15336c

1389420 has 96 divisors (see below), whose sum is σ = 4515840. Its totient is φ = 354240.

The previous prime is 1389403. The next prime is 1389431. The reversal of 1389420 is 249831.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16699 + ... + 16781.

It is an arithmetic number, because the mean of its divisors is an integer number (47040).

21389420 is an apocalyptic number.

1389420 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 1389420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2257920).

1389420 is an abundant number, since it is smaller than the sum of its proper divisors (3126420).

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

1389420 is a wasteful number, since it uses less digits than its factorization.

1389420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1389420 is about 1178.7366118010. The cubic root of 1389420 is about 111.5863782657.

The spelling of 1389420 in words is "one million, three hundred eighty-nine thousand, four hundred twenty".

Divisors: 1 2 3 4 5 6 9 10 12 15 18 20 27 30 31 36 45 54 60 62 83 90 93 108 124 135 155 166 180 186 249 270 279 310 332 372 415 465 498 540 558 620 747 830 837 930 996 1116 1245 1395 1494 1660 1674 1860 2241 2490 2573 2790 2988 3348 3735 4185 4482 4980 5146 5580 7470 7719 8370 8964 10292 11205 12865 14940 15438 16740 22410 23157 25730 30876 38595 44820 46314 51460 69471 77190 92628 115785 138942 154380 231570 277884 347355 463140 694710 1389420