856172236 has 6 divisors (see below), whose sum is σ = 1498301420. Its totient is φ = 428086116.

The previous prime is 856172231. The next prime is 856172237. The reversal of 856172236 is 632271658.

It is not an unprimeable number, because it can be changed into a prime (856172231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107021526 + ... + 107021533.

Almost surely, 2^856172236 is an apocalyptic number.

It is an amenable number.

856172236 is a deficient number, since it is larger than the sum of its proper divisors (642129184).

856172236 is a wasteful number, since it uses less digits than its factorization.

856172236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214043063 (or 214043061 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 856172236 is about 29260.4209812504. The cubic root of 856172236 is about 949.5555579431. Note that the first 5 decimals are identical.

The spelling of 856172236 in words is "eight hundred fifty-six million, one hundred seventy-two thousand, two hundred thirty-six".