138755560 has 16 divisors (see below), whose sum is σ = 312200100. Its totient is φ = 55502208.

The previous prime is 138755557. The next prime is 138755569. The reversal of 138755560 is 65557831.

It can be written as a sum of positive squares in 2 ways, for example, as 134420836 + 4334724 = 11594^2 + 2082^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 3468889 = 138755560 / (1 + 3 + 8 + 7 + 5 + 5 + 5 + 6 + 0).

It is not an unprimeable number, because it can be changed into a prime (138755569) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1734405 + ... + 1734484.

Almost surely, 2^138755560 is an apocalyptic number.

138755560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138755560 is an abundant number, since it is smaller than the sum of its proper divisors (173444540).

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

138755560 is a wasteful number, since it uses less digits than its factorization.

138755560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468900 (or 3468896 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 40.

The square root of 138755560 is about 11779.4549958816. The cubic root of 138755560 is about 517.7063177278.

The spelling of 138755560 in words is "one hundred thirty-eight million, seven hundred fifty-five thousand, five hundred sixty".