812991984 has 40 divisors (see below), whose sum is σ = 2400263040. Its totient is φ = 232283328.

The previous prime is 812991983. The next prime is 812992031. The reversal of 812991984 is 489199218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812991983) 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, 1209474 + ... + 1210145.

It is an arithmetic number, because the mean of its divisors is an integer number (60006576).

Almost surely, 2^812991984 is an apocalyptic number.

812991984 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

812991984 is an abundant number, since it is smaller than the sum of its proper divisors (1587271056).

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

812991984 is a wasteful number, since it uses less digits than its factorization.

812991984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2419637 (or 2419631 counting only the distinct ones).

The product of its digits is 373248, while the sum is 51.

The square root of 812991984 is about 28513.0142917230. The cubic root of 812991984 is about 933.3160933323.

The spelling of 812991984 in words is "eight hundred twelve million, nine hundred ninety-one thousand, nine hundred eighty-four".