812921874 has 16 divisors (see below), whose sum is σ = 1626179520. Its totient is φ = 270918000.

The previous prime is 812921873. The next prime is 812921899. The reversal of 812921874 is 478129218.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (812921873) by changing a digit.

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, 26499 + ... + 48249.

It is an arithmetic number, because the mean of its divisors is an integer number (101636220).

Almost surely, 2^812921874 is an apocalyptic number.

812921874 is an abundant number, since it is smaller than the sum of its proper divisors (813257646).

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

812921874 is a wasteful number, since it uses less digits than its factorization.

812921874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27985.

The product of its digits is 64512, while the sum is 42.

The square root of 812921874 is about 28511.7848266291. The cubic root of 812921874 is about 933.2892637639.

It can be divided in two parts, 8129 and 21874, that added together give a palindrome (30003).

The spelling of 812921874 in words is "eight hundred twelve million, nine hundred twenty-one thousand, eight hundred seventy-four".