857438964 has 18 divisors (see below), whose sum is σ = 2167415250. Its totient is φ = 285812976.

The previous prime is 857438957. The next prime is 857438971. The reversal of 857438964 is 469834758.

857438964 is a `hidden beast` number, since 8 + 574 + 3 + 8 + 9 + 64 = 666.

It is an interprime number because it is at equal distance from previous prime (857438957) and next prime (857438971).

It can be written as a sum of positive squares in only one way, i.e., 771728400 + 85710564 = 27780^2 + 9258^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 857438964.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11908839 + ... + 11908910.

Almost surely, 2^857438964 is an apocalyptic number.

It is an amenable number.

857438964 is an abundant number, since it is smaller than the sum of its proper divisors (1309976286).

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

857438964 is a wasteful number, since it uses less digits than its factorization.

857438964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23817759 (or 23817754 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 857438964 is about 29282.0587390982. The cubic root of 857438964 is about 950.0236241586.

The spelling of 857438964 in words is "eight hundred fifty-seven million, four hundred thirty-eight thousand, nine hundred sixty-four".