813638807 has 4 divisors (see below), whose sum is σ = 821243016. Its totient is φ = 806034600.

The previous prime is 813638797. The next prime is 813638831. The reversal of 813638807 is 708836318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 813638807 - 2¹⁴ = 813622423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813638857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3801944 + ... + 3802157.

It is an arithmetic number, because the mean of its divisors is an integer number (205310754).

Almost surely, 2^813638807 is an apocalyptic number.

813638807 is a deficient number, since it is larger than the sum of its proper divisors (7604209).

813638807 is a wasteful number, since it uses less digits than its factorization.

813638807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7604208.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 813638807 is about 28524.3546289833. The cubic root of 813638807 is about 933.5635456639.

The spelling of 813638807 in words is "eight hundred thirteen million, six hundred thirty-eight thousand, eight hundred seven".