891372812 has 24 divisors (see below), whose sum is σ = 1711562832. Its totient is φ = 402824000.

The previous prime is 891372803. The next prime is 891372857. The reversal of 891372812 is 218273198.

It is a self number, because there is not a number n which added to its sum of digits gives 891372812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50939 + ... + 66162.

It is an arithmetic number, because the mean of its divisors is an integer number (71315118).

Almost surely, 2^891372812 is an apocalyptic number.

It is an amenable number.

891372812 is a deficient number, since it is larger than the sum of its proper divisors (820190020).

891372812 is a wasteful number, since it uses less digits than its factorization.

891372812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117289 (or 117287 counting only the distinct ones).

The product of its digits is 48384, while the sum is 41.

The square root of 891372812 is about 29855.8672960609. The cubic root of 891372812 is about 962.3944898567.

The spelling of 891372812 in words is "eight hundred ninety-one million, three hundred seventy-two thousand, eight hundred twelve".