813944396 has 12 divisors (see below), whose sum is σ = 1435276920. Its totient is φ = 403865280.

The previous prime is 813944387. The next prime is 813944407. The reversal of 813944396 is 693449318.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 813944396.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776141 + ... + 777188.

It is an arithmetic number, because the mean of its divisors is an integer number (119606410).

Almost surely, 2^813944396 is an apocalyptic number.

It is an amenable number.

813944396 is a deficient number, since it is larger than the sum of its proper divisors (621332524).

813944396 is a wasteful number, since it uses less digits than its factorization.

813944396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553464 (or 1553462 counting only the distinct ones).

The product of its digits is 559872, while the sum is 47.

The square root of 813944396 is about 28529.7107591367. The cubic root of 813944396 is about 933.6804079370.

The spelling of 813944396 in words is "eight hundred thirteen million, nine hundred forty-four thousand, three hundred ninety-six".