138255957 has 32 divisors (see below), whose sum is σ = 237404160. Its totient is φ = 77883120.

The previous prime is 138255947. The next prime is 138255961. The reversal of 138255957 is 759552831.

138255957 is a `hidden beast` number, since 1 + 38 + 25 + 595 + 7 = 666.

It is not a de Polignac number, because 138255957 - 2⁸ = 138255701 is a prime.

It is a super-2 number, since 2×138255957² = 38229419291971698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138255937) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8268 + ... + 18570.

It is an arithmetic number, because the mean of its divisors is an integer number (7418880).

Almost surely, 2^138255957 is an apocalyptic number.

It is an amenable number.

138255957 is a deficient number, since it is larger than the sum of its proper divisors (99148203).

138255957 is a wasteful number, since it uses less digits than its factorization.

138255957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10390 (or 10384 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The square root of 138255957 is about 11758.2293309835. The cubic root of 138255957 is about 517.0842197001.

The spelling of 138255957 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, nine hundred fifty-seven".