812293440 has 112 divisors (see below), whose sum is σ = 2947489152. Its totient is φ = 185665536.

The previous prime is 812293421. The next prime is 812293481. The reversal of 812293440 is 44392218.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53719 + ... + 67158.

Almost surely, 2^812293440 is an apocalyptic number.

812293440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

812293440 is an abundant number, since it is smaller than the sum of its proper divisors (2135195712).

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

812293440 is a wasteful number, since it uses less digits than its factorization.

812293440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120904 (or 120894 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 812293440 is about 28500.7620950739. The cubic root of 812293440 is about 933.0487068608.

The spelling of 812293440 in words is "eight hundred twelve million, two hundred ninety-three thousand, four hundred forty".