57139739 has 4 divisors (see below), whose sum is σ = 57158880. Its totient is φ = 57120600.

The previous prime is 57139699. The next prime is 57139741. The reversal of 57139739 is 93793175.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57139739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57139739.

It is not an unprimeable number, because it can be changed into a prime (57139769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4019 + ... + 11420.

It is an arithmetic number, because the mean of its divisors is an integer number (14289720).

Almost surely, 2^57139739 is an apocalyptic number.

57139739 is a deficient number, since it is larger than the sum of its proper divisors (19141).

57139739 is a wasteful number, since it uses less digits than its factorization.

57139739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19140.

The product of its digits is 178605, while the sum is 44.

The square root of 57139739 is about 7559.0832116071. The cubic root of 57139739 is about 385.1643510374.

The spelling of 57139739 in words is "fifty-seven million, one hundred thirty-nine thousand, seven hundred thirty-nine".