812097393 has 4 divisors (see below), whose sum is σ = 1082796528. Its totient is φ = 541398260.

The previous prime is 812097389. The next prime is 812097413. The reversal of 812097393 is 393790218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 812097393 - 2² = 812097389 is a prime.

It is not an unprimeable number, because it can be changed into a prime (812097313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135349563 + ... + 135349568.

It is an arithmetic number, because the mean of its divisors is an integer number (270699132).

Almost surely, 2^812097393 is an apocalyptic number.

It is an amenable number.

812097393 is a deficient number, since it is larger than the sum of its proper divisors (270699135).

812097393 is a wasteful number, since it uses less digits than its factorization.

812097393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270699134.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 812097393 is about 28497.3225584440. The cubic root of 812097393 is about 932.9736370610.

The spelling of 812097393 in words is "eight hundred twelve million, ninety-seven thousand, three hundred ninety-three".