138687955 has 64 divisors (see below), whose sum is σ = 212779008. Its totient is φ = 84602880.

The previous prime is 138687917. The next prime is 138687959. The reversal of 138687955 is 559786831.

It is not a de Polignac number, because 138687955 - 2¹¹ = 138685907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138687959) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1346434 + ... + 1346536.

It is an arithmetic number, because the mean of its divisors is an integer number (3324672).

Almost surely, 2^138687955 is an apocalyptic number.

138687955 is a deficient number, since it is larger than the sum of its proper divisors (74091053).

138687955 is a wasteful number, since it uses less digits than its factorization.

138687955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236.

The product of its digits is 1814400, while the sum is 52.

The square root of 138687955 is about 11776.5850313238. The cubic root of 138687955 is about 517.6222244697.

The spelling of 138687955 in words is "one hundred thirty-eight million, six hundred eighty-seven thousand, nine hundred fifty-five".