857944969 has 12 divisors (see below), whose sum is σ = 998554500. Its totient is φ = 734985888.

The previous prime is 857944957. The next prime is 857944979. The reversal of 857944969 is 969449758.

It can be written as a sum of positive squares in 2 ways, for example, as 361190025 + 496754944 = 19005^2 + 22288^2 .

It is a de Polignac number, because none of the positive numbers 2^k-857944969 is a prime.

It is a super-2 number, since 2×857944969² = 1472139139664821922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857944979) 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, 121467 + ... + 128335.

It is an arithmetic number, because the mean of its divisors is an integer number (83212875).

Almost surely, 2^857944969 is an apocalyptic number.

It is an amenable number.

857944969 is a deficient number, since it is larger than the sum of its proper divisors (140609531).

857944969 is a wasteful number, since it uses less digits than its factorization.

857944969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9432 (or 9425 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 61.

The square root of 857944969 is about 29290.6976530092. The cubic root of 857944969 is about 950.2104682344.

The spelling of 857944969 in words is "eight hundred fifty-seven million, nine hundred forty-four thousand, nine hundred sixty-nine".