57440139 has 16 divisors (see below), whose sum is σ = 78702624. Its totient is φ = 37241600.

The previous prime is 57440087. The next prime is 57440147. The reversal of 57440139 is 93104475.

It is a cyclic number.

It is not a de Polignac number, because 57440139 - 2⁸ = 57439883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57440839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56197 + ... + 57209.

It is an arithmetic number, because the mean of its divisors is an integer number (4918914).

Almost surely, 2^57440139 is an apocalyptic number.

57440139 is a deficient number, since it is larger than the sum of its proper divisors (21262485).

57440139 is a wasteful number, since it uses less digits than its factorization.

57440139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 57440139 is about 7578.9272987673. The cubic root of 57440139 is about 385.8381448003.

The spelling of 57440139 in words is "fifty-seven million, four hundred forty thousand, one hundred thirty-nine".