813873401 has 4 divisors (see below), whose sum is σ = 887861904. Its totient is φ = 739884900.

The previous prime is 813873397. The next prime is 813873421. The reversal of 813873401 is 104378318.

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 813873401 - 2² = 813873397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813873421) 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, 36994235 + ... + 36994256.

It is an arithmetic number, because the mean of its divisors is an integer number (221965476).

Almost surely, 2^813873401 is an apocalyptic number.

It is an amenable number.

813873401 is a deficient number, since it is larger than the sum of its proper divisors (73988503).

813873401 is a wasteful number, since it uses less digits than its factorization.

813873401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73988502.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 813873401 is about 28528.4665027758. The cubic root of 813873401 is about 933.6532608869.

The spelling of 813873401 in words is "eight hundred thirteen million, eight hundred seventy-three thousand, four hundred one".