57142739 has 4 divisors (see below), whose sum is σ = 58111320. Its totient is φ = 56174160.

The previous prime is 57142733. The next prime is 57142769. The reversal of 57142739 is 93724175.

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-57142739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57142733) 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, 484202 + ... + 484319.

It is an arithmetic number, because the mean of its divisors is an integer number (14527830).

Almost surely, 2^57142739 is an apocalyptic number.

57142739 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

57142739 is a deficient number, since it is larger than the sum of its proper divisors (968581).

57142739 is an equidigital number, since it uses as much as digits as its factorization.

57142739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968580.

The product of its digits is 52920, while the sum is 38.

The square root of 57142739 is about 7559.2816457650. The cubic root of 57142739 is about 385.1710916634.

The spelling of 57142739 in words is "fifty-seven million, one hundred forty-two thousand, seven hundred thirty-nine".