138957637 has 16 divisors (see below), whose sum is σ = 171859072. Its totient is φ = 109408320.

The previous prime is 138957629. The next prime is 138957649. The reversal of 138957637 is 736759831.

It is not a de Polignac number, because 138957637 - 2³ = 138957629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138957737) 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, 15583 + ... + 22819.

It is an arithmetic number, because the mean of its divisors is an integer number (10741192).

Almost surely, 2^138957637 is an apocalyptic number.

It is an amenable number.

138957637 is a deficient number, since it is larger than the sum of its proper divisors (32901435).

138957637 is a wasteful number, since it uses less digits than its factorization.

138957637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7468.

The product of its digits is 952560, while the sum is 49.

The square root of 138957637 is about 11788.0293942626. The cubic root of 138957637 is about 517.9575167775.

The spelling of 138957637 in words is "one hundred thirty-eight million, nine hundred fifty-seven thousand, six hundred thirty-seven".