57172839 has 8 divisors (see below), whose sum is σ = 76327920. Its totient is φ = 38066496.

The previous prime is 57172837. The next prime is 57172847. The reversal of 57172839 is 93827175.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 57172839 - 2¹ = 57172837 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 57172839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57172837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9352 + ... + 14205.

It is an arithmetic number, because the mean of its divisors is an integer number (9540990).

Almost surely, 2^57172839 is an apocalyptic number.

57172839 is a deficient number, since it is larger than the sum of its proper divisors (19155081).

57172839 is a wasteful number, since it uses less digits than its factorization.

57172839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24369.

The product of its digits is 105840, while the sum is 42.

The square root of 57172839 is about 7561.2723135726. The cubic root of 57172839 is about 385.2387095562.

The spelling of 57172839 in words is "fifty-seven million, one hundred seventy-two thousand, eight hundred thirty-nine".