857953139 has 4 divisors (see below), whose sum is σ = 887537760. Its totient is φ = 828368520.

The previous prime is 857953133. The next prime is 857953141. The reversal of 857953139 is 931359758.

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-857953139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857953133) 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, 14792267 + ... + 14792324.

It is an arithmetic number, because the mean of its divisors is an integer number (221884440).

Almost surely, 2^857953139 is an apocalyptic number.

857953139 is a deficient number, since it is larger than the sum of its proper divisors (29584621).

857953139 is a wasteful number, since it uses less digits than its factorization.

857953139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29584620.

The product of its digits is 1020600, while the sum is 50.

The square root of 857953139 is about 29290.8371167504. The cubic root of 857953139 is about 950.2134844321.

The spelling of 857953139 in words is "eight hundred fifty-seven million, nine hundred fifty-three thousand, one hundred thirty-nine".