157921938 has 24 divisors (see below), whose sum is σ = 342997200. Its totient is φ = 52512504.

The previous prime is 157921903. The next prime is 157921943. The reversal of 157921938 is 839129751.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 157921893 and 157921902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2928 + ... + 18011.

It is an arithmetic number, because the mean of its divisors is an integer number (14291550).

Almost surely, 2^157921938 is an apocalyptic number.

157921938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

157921938 is an abundant number, since it is smaller than the sum of its proper divisors (185075262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

157921938 is a wasteful number, since it uses less digits than its factorization.

157921938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21366 (or 21363 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 157921938 is about 12566.6995667120. The cubic root of 157921938 is about 540.5229707243.

The spelling of 157921938 in words is "one hundred fifty-seven million, nine hundred twenty-one thousand, nine hundred thirty-eight".