812906393 has 24 divisors (see below), whose sum is σ = 930401280. Its totient is φ = 707952960.

The previous prime is 812906389. The next prime is 812906491. The reversal of 812906393 is 393609218.

It is not a de Polignac number, because 812906393 - 2² = 812906389 is a prime.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 812906393.

It is not an unprimeable number, because it can be changed into a prime (812906383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1229483 + ... + 1230143.

It is an arithmetic number, because the mean of its divisors is an integer number (38766720).

Almost surely, 2^812906393 is an apocalyptic number.

It is an amenable number.

812906393 is a deficient number, since it is larger than the sum of its proper divisors (117494887).

812906393 is a wasteful number, since it uses less digits than its factorization.

812906393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089 (or 1076 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 812906393 is about 28511.5133411049. The cubic root of 812906393 is about 933.2833393147.

The spelling of 812906393 in words is "eight hundred twelve million, nine hundred six thousand, three hundred ninety-three".