57399390 has 24 divisors (see below), whose sum is σ = 149238648. Its totient is φ = 15306480.

The previous prime is 57399379. The next prime is 57399409. The reversal of 57399390 is 9399375.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 318796 + ... + 318975.

It is an arithmetic number, because the mean of its divisors is an integer number (6218277).

Almost surely, 2^57399390 is an apocalyptic number.

57399390 is an abundant number, since it is smaller than the sum of its proper divisors (91839258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57399390 is a wasteful number, since it uses less digits than its factorization.

57399390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637784 (or 637781 counting only the distinct ones).

The product of its (nonzero) digits is 229635, while the sum is 45.

The square root of 57399390 is about 7576.2385126130. The cubic root of 57399390 is about 385.7468831945.

It can be divided in two parts, 5739 and 9390, that added together give a square (15129 = 123²).

The spelling of 57399390 in words is "fifty-seven million, three hundred ninety-nine thousand, three hundred ninety".