57238939 has 2 divisors, whose sum is σ = 57238940. Its totient is φ = 57238938.

The previous prime is 57238931. The next prime is 57238981. The reversal of 57238939 is 93983275.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 57238939 - 2³ = 57238931 is a prime.

It is a super-2 number, since 2×57238939² = 6552592275691442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (57238931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28619469 + 28619470.

It is an arithmetic number, because the mean of its divisors is an integer number (28619470).

Almost surely, 2^57238939 is an apocalyptic number.

57238939 is a deficient number, since it is larger than the sum of its proper divisors (1).

57238939 is an equidigital number, since it uses as much as digits as its factorization.

57238939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The square root of 57238939 is about 7565.6420084485. The cubic root of 57238939 is about 385.3871161072.

The spelling of 57238939 in words is "fifty-seven million, two hundred thirty-eight thousand, nine hundred thirty-nine".