857615139 has 12 divisors (see below), whose sum is σ = 1251043872. Its totient is φ = 566082000.

The previous prime is 857615123. The next prime is 857615153. The reversal of 857615139 is 931516758.

It is a happy number.

857615139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 857615139 - 2⁴ = 857615123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 857615094 and 857615103.

It is not an unprimeable number, because it can be changed into a prime (857615189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 470827 + ... + 472644.

It is an arithmetic number, because the mean of its divisors is an integer number (104253656).

Almost surely, 2^857615139 is an apocalyptic number.

857615139 is a deficient number, since it is larger than the sum of its proper divisors (393428733).

857615139 is a wasteful number, since it uses less digits than its factorization.

857615139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943578 (or 943575 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 857615139 is about 29285.0668259439. The cubic root of 857615139 is about 950.0886857188.

The spelling of 857615139 in words is "eight hundred fifty-seven million, six hundred fifteen thousand, one hundred thirty-nine".