857399136 has 48 divisors (see below), whose sum is σ = 2455282368. Its totient is φ = 259817600.

The previous prime is 857399099. The next prime is 857399143. The reversal of 857399136 is 631993758.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404910 + ... + 407021.

It is an arithmetic number, because the mean of its divisors is an integer number (51151716).

Almost surely, 2^857399136 is an apocalyptic number.

It is an amenable number.

857399136 is an abundant number, since it is smaller than the sum of its proper divisors (1597883232).

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

857399136 is a wasteful number, since it uses less digits than its factorization.

857399136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811955 (or 811947 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 51.

The square root of 857399136 is about 29281.3786560674. The cubic root of 857399136 is about 950.0089144131.

It can be divided in two parts, 857 and 399136, that added together give a palindrome (399993).

The spelling of 857399136 in words is "eight hundred fifty-seven million, three hundred ninety-nine thousand, one hundred thirty-six".