856806953 has 8 divisors (see below), whose sum is σ = 907721640. Its totient is φ = 805949440.

The previous prime is 856806931. The next prime is 856806959. The reversal of 856806953 is 359608658.

It can be written as a sum of positive squares in 4 ways, for example, as 17372224 + 839434729 = 4168^2 + 28973^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856806953 - 2⁸ = 856806697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (856806959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18773 + ... + 45453.

It is an arithmetic number, because the mean of its divisors is an integer number (113465205).

Almost surely, 2^856806953 is an apocalyptic number.

It is an amenable number.

856806953 is a deficient number, since it is larger than the sum of its proper divisors (50914687).

856806953 is a wasteful number, since it uses less digits than its factorization.

856806953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28587.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The square root of 856806953 is about 29271.2649709574. The cubic root of 856806953 is about 949.7901486619.

The spelling of 856806953 in words is "eight hundred fifty-six million, eight hundred six thousand, nine hundred fifty-three".