138902687 has 16 divisors (see below), whose sum is σ = 173478912. Its totient is φ = 108047520.

The previous prime is 138902683. The next prime is 138902693. The reversal of 138902687 is 786209831.

It is not a de Polignac number, because 138902687 - 2² = 138902683 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138902683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57098 + ... + 59480.

It is an arithmetic number, because the mean of its divisors is an integer number (10842432).

Almost surely, 2^138902687 is an apocalyptic number.

138902687 is a deficient number, since it is larger than the sum of its proper divisors (34576225).

138902687 is a wasteful number, since it uses less digits than its factorization.

138902687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3158.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 138902687 is about 11785.6984095131. The cubic root of 138902687 is about 517.8892333335.

The spelling of 138902687 in words is "one hundred thirty-eight million, nine hundred two thousand, six hundred eighty-seven".