857239992 has 96 divisors (see below), whose sum is σ = 2768762880. Its totient is φ = 234273600.

The previous prime is 857239979. The next prime is 857240047. The reversal of 857239992 is 299932758.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25384 + ... + 48567.

It is an arithmetic number, because the mean of its divisors is an integer number (28841280).

Almost surely, 2^857239992 is an apocalyptic number.

It is an amenable number.

857239992 is an abundant number, since it is smaller than the sum of its proper divisors (1911522888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

857239992 is a wasteful number, since it uses less digits than its factorization.

857239992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73993 (or 73986 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 857239992 is about 29278.6610349585. The cubic root of 857239992 is about 949.9501329318.

The spelling of 857239992 in words is "eight hundred fifty-seven million, two hundred thirty-nine thousand, nine hundred ninety-two".