813922747 has 8 divisors (see below), whose sum is σ = 888166512. Its totient is φ = 739720800.

The previous prime is 813922709. The next prime is 813922751. The reversal of 813922747 is 747229318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813922747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813922757) 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, 41497 + ... + 57877.

It is an arithmetic number, because the mean of its divisors is an integer number (111020814).

Almost surely, 2^813922747 is an apocalyptic number.

813922747 is a deficient number, since it is larger than the sum of its proper divisors (74243765).

813922747 is a wasteful number, since it uses less digits than its factorization.

813922747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20909.

The product of its digits is 169344, while the sum is 43.

The square root of 813922747 is about 28529.3313451262. The cubic root of 813922747 is about 933.6721299652.

The spelling of 813922747 in words is "eight hundred thirteen million, nine hundred twenty-two thousand, seven hundred forty-seven".