138172975 has 24 divisors (see below), whose sum is σ = 177647360. Its totient is φ = 106535520.

The previous prime is 138172967. The next prime is 138172999. The reversal of 138172975 is 579271831.

138172975 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138172975 - 2³ = 138172967 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84112 + ... + 85738.

Almost surely, 2^138172975 is an apocalyptic number.

138172975 is a deficient number, since it is larger than the sum of its proper divisors (39474385).

138172975 is a wasteful number, since it uses less digits than its factorization.

138172975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759 (or 1754 counting only the distinct ones).

The product of its digits is 105840, while the sum is 43.

The square root of 138172975 is about 11754.7001237803. The cubic root of 138172975 is about 516.9807467137.

The spelling of 138172975 in words is "one hundred thirty-eight million, one hundred seventy-two thousand, nine hundred seventy-five".