42957931 has 8 divisors (see below), whose sum is σ = 43999200. Its totient is φ = 41925312.

The previous prime is 42957923. The next prime is 42957947. The reversal of 42957931 is 13975924.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42957931 - 2³ = 42957923 is a prime.

It is a super-2 number, since 2×42957931² = 3690767671601522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42057931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8511 + ... + 12583.

It is an arithmetic number, because the mean of its divisors is an integer number (5499900).

Almost surely, 2^42957931 is an apocalyptic number.

42957931 is a deficient number, since it is larger than the sum of its proper divisors (1041269).

42957931 is a wasteful number, since it uses less digits than its factorization.

42957931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4325.

The product of its digits is 68040, while the sum is 40.

The square root of 42957931 is about 6554.2300081703. The cubic root of 42957931 is about 350.2255172452.

The spelling of 42957931 in words is "forty-two million, nine hundred fifty-seven thousand, nine hundred thirty-one".