857509139 has 8 divisors (see below), whose sum is σ = 878084592. Its totient is φ = 836962560.

The previous prime is 857509123. The next prime is 857509141. The reversal of 857509139 is 931905758.

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

It is a cyclic number.

It is not a de Polignac number, because 857509139 - 2⁴ = 857509123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 857509093 and 857509102.

It is not an unprimeable number, because it can be changed into a prime (857509339) 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, 60359 + ... + 73199.

It is an arithmetic number, because the mean of its divisors is an integer number (109760574).

Almost surely, 2^857509139 is an apocalyptic number.

857509139 is a deficient number, since it is larger than the sum of its proper divisors (20575453).

857509139 is a wasteful number, since it uses less digits than its factorization.

857509139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14437.

The product of its (nonzero) digits is 340200, while the sum is 47.

The square root of 857509139 is about 29283.2569739092. The cubic root of 857509139 is about 950.0495409068.

The spelling of 857509139 in words is "eight hundred fifty-seven million, five hundred nine thousand, one hundred thirty-nine".