856961900 has 18 divisors (see below), whose sum is σ = 1859607540. Its totient is φ = 342784720.

The previous prime is 856961893. The next prime is 856961909. The reversal of 856961900 is 9169658.

It is a super-2 number, since 2×856961900² = 1468767396103220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (856961909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4284710 + ... + 4284909.

It is an arithmetic number, because the mean of its divisors is an integer number (103311530).

Almost surely, 2^856961900 is an apocalyptic number.

It is an amenable number.

856961900 is an abundant number, since it is smaller than the sum of its proper divisors (1002645640).

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

856961900 is a wasteful number, since it uses less digits than its factorization.

856961900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8569633 (or 8569626 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 856961900 is about 29273.9115937724. The cubic root of 856961900 is about 949.8473993114.

The spelling of 856961900 in words is "eight hundred fifty-six million, nine hundred sixty-one thousand, nine hundred".