857811812 has 48 divisors (see below), whose sum is σ = 1776465600. Its totient is φ = 357298560.

The previous prime is 857811809. The next prime is 857811833. The reversal of 857811812 is 218118758.

It is a super-2 number, since 2×857811812² = 1471682209613446688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 857811812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74114 + ... + 84902.

It is an arithmetic number, because the mean of its divisors is an integer number (37009700).

Almost surely, 2^857811812 is an apocalyptic number.

It is an amenable number.

857811812 is an abundant number, since it is smaller than the sum of its proper divisors (918653788).

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

857811812 is a wasteful number, since it uses less digits than its factorization.

857811812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10956 (or 10954 counting only the distinct ones).

The product of its digits is 35840, while the sum is 41.

The square root of 857811812 is about 29288.4245393978. The cubic root of 857811812 is about 950.1613066812.

The spelling of 857811812 in words is "eight hundred fifty-seven million, eight hundred eleven thousand, eight hundred twelve".