856814408 has 36 divisors (see below), whose sum is σ = 1639635795. Its totient is φ = 419755440.

The previous prime is 856814401. The next prime is 856814449. The reversal of 856814408 is 804418658.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 428407204 + 428407204 = 20698^2 + 20698^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=20698.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856814401) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6540503 + ... + 6540633.

Almost surely, 2^856814408 is an apocalyptic number.

It is an amenable number.

856814408 is a deficient number, since it is larger than the sum of its proper divisors (782821387).

856814408 is an equidigital number, since it uses as much as digits as its factorization.

856814408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 44.

The square root of 856814408 is about 29271.3923139983. The cubic root of 856814408 is about 949.7929033334.

The spelling of 856814408 in words is "eight hundred fifty-six million, eight hundred fourteen thousand, four hundred eight".