| Base | Representation |
|---|---|
| bin | 10000101001101… |
| … | …11000000110100 |
| 3 | 100201211210002100 |
| 4 | 20110313000310 |
| 5 | 241224422230 |
| 6 | 21505542100 |
| 7 | 3314211432 |
| oct | 1024670064 |
| 9 | 321753070 |
| 10 | 139685940 |
| 11 | 71938129 |
| 12 | 3a944930 |
| 13 | 22c2a404 |
| 14 | 147a1d52 |
| 15 | c3e3660 |
| hex | 8537034 |
139685940 has 144 divisors (see below), whose sum is σ = 452874240. Its totient is φ = 34728960.
The previous prime is 139685939. The next prime is 139685941. The reversal of 139685940 is 49586931.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (139685939) and next prime (139685941).
It is a Harshad number since it is a multiple of its sum of digits (45).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (139685941) by changing a digit.
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 47 ways as a sum of consecutive naturals, for example, 584341 + ... + 584579.
It is an arithmetic number, because the mean of its divisors is an integer number (3144960).
Almost surely, 2139685940 is an apocalyptic number.
139685940 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 139685940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226437120).
139685940 is an abundant number, since it is smaller than the sum of its proper divisors (313188300).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
139685940 is a wasteful number, since it uses less digits than its factorization.
139685940 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 462 (or 457 counting only the distinct ones).
The product of its (nonzero) digits is 233280, while the sum is 45.
The square root of 139685940 is about 11818.8806576596. The cubic root of 139685940 is about 518.8608445575.
Subtracting from 139685940 its reverse (49586931), we obtain a palindrome (90099009).
It can be divided in two parts, 139685 and 940, that added together give a square (140625 = 3752).
The spelling of 139685940 in words is "one hundred thirty-nine million, six hundred eighty-five thousand, nine hundred forty".
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