57209139 has 16 divisors (see below), whose sum is σ = 91274400. Its totient is φ = 35205408.

The previous prime is 57209123. The next prime is 57209149. The reversal of 57209139 is 93190275.

It is not a de Polignac number, because 57209139 - 2⁴ = 57209123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57209149) 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, 81144 + ... + 81845.

It is an arithmetic number, because the mean of its divisors is an integer number (5704650).

Almost surely, 2^57209139 is an apocalyptic number.

57209139 is a deficient number, since it is larger than the sum of its proper divisors (34065261).

57209139 is a wasteful number, since it uses less digits than its factorization.

57209139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163011 (or 163005 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 57209139 is about 7563.6723223577. The cubic root of 57209139 is about 385.3202238256.

The spelling of 57209139 in words is "fifty-seven million, two hundred nine thousand, one hundred thirty-nine".