811917372 has 48 divisors (see below), whose sum is σ = 2177667072. Its totient is φ = 230631360.

The previous prime is 811917361. The next prime is 811917377. The reversal of 811917372 is 273719118.

It is a self number, because there is not a number n which added to its sum of digits gives 811917372.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811917377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13404 + ... + 42467.

It is an arithmetic number, because the mean of its divisors is an integer number (45368064).

Almost surely, 2^811917372 is an apocalyptic number.

It is an amenable number.

811917372 is an abundant number, since it is smaller than the sum of its proper divisors (1365749700).

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

811917372 is a wasteful number, since it uses less digits than its factorization.

811917372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56058 (or 56056 counting only the distinct ones).

The product of its digits is 21168, while the sum is 39.

The square root of 811917372 is about 28494.1638234920. The cubic root of 811917372 is about 932.9046932534.

The spelling of 811917372 in words is "eight hundred eleven million, nine hundred seventeen thousand, three hundred seventy-two".