42339931 has 2 divisors, whose sum is σ = 42339932. Its totient is φ = 42339930.

The previous prime is 42339929. The next prime is 42339937. The reversal of 42339931 is 13993324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42339931 - 2¹ = 42339929 is a prime.

It is a super-2 number, since 2×42339931² = 3585339514169522, which contains 22 as substring.

Together with 42339929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42339937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21169965 + 21169966.

It is an arithmetic number, because the mean of its divisors is an integer number (21169966).

Almost surely, 2^42339931 is an apocalyptic number.

42339931 is a deficient number, since it is larger than the sum of its proper divisors (1).

42339931 is an equidigital number, since it uses as much as digits as its factorization.

42339931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 34.

The square root of 42339931 is about 6506.9140919487. The cubic root of 42339931 is about 348.5379308761.

The spelling of 42339931 in words is "forty-two million, three hundred thirty-nine thousand, nine hundred thirty-one".