157138172 has 6 divisors (see below), whose sum is σ = 274991808. Its totient is φ = 78569084.

The previous prime is 157138171. The next prime is 157138217. The reversal of 157138172 is 271831751.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157138171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19642268 + ... + 19642275.

It is an arithmetic number, because the mean of its divisors is an integer number (45831968).

Almost surely, 2^157138172 is an apocalyptic number.

It is an amenable number.

157138172 is a deficient number, since it is larger than the sum of its proper divisors (117853636).

157138172 is a wasteful number, since it uses less digits than its factorization.

157138172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39284547 (or 39284545 counting only the distinct ones).

The product of its digits is 11760, while the sum is 35.

The square root of 157138172 is about 12535.4765366140. The cubic root of 157138172 is about 539.6272828126.

The spelling of 157138172 in words is "one hundred fifty-seven million, one hundred thirty-eight thousand, one hundred seventy-two".