157977421 has 12 divisors (see below), whose sum is σ = 184023360. Its totient is φ = 135222360.

The previous prime is 157977389. The next prime is 157977439. The reversal of 157977421 is 124779751.

157977421 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 157977421 - 2⁵ = 157977389 is a prime.

It is a super-2 number, since 2×157977421² = 49913731091622482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157977451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42870 + ... + 46408.

It is an arithmetic number, because the mean of its divisors is an integer number (15335280).

Almost surely, 2^157977421 is an apocalyptic number.

It is an amenable number.

157977421 is a deficient number, since it is larger than the sum of its proper divisors (26045939).

157977421 is an equidigital number, since it uses as much as digits as its factorization.

157977421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4464 (or 4457 counting only the distinct ones).

The product of its digits is 123480, while the sum is 43.

The square root of 157977421 is about 12568.9069134909. The cubic root of 157977421 is about 540.5862642834.

The spelling of 157977421 in words is "one hundred fifty-seven million, nine hundred seventy-seven thousand, four hundred twenty-one".