404002813 has 4 divisors (see below), whose sum is σ = 404462268. Its totient is φ = 403543360.

The previous prime is 404002787. The next prime is 404002829. The reversal of 404002813 is 318200404.

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

It can be written as a sum of positive squares in 2 ways, for example, as 151733124 + 252269689 = 12318^2 + 15883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404002813 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 (404002853) 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, 228406 + ... + 230167.

It is an arithmetic number, because the mean of its divisors is an integer number (101115567).

Almost surely, 2^404002813 is an apocalyptic number.

It is an amenable number.

404002813 is a deficient number, since it is larger than the sum of its proper divisors (459455).

404002813 is an equidigital number, since it uses as much as digits as its factorization.

404002813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459454.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 404002813 is about 20099.8212181104. The cubic root of 404002813 is about 739.2558949446.

The spelling of 404002813 in words is "four hundred four million, two thousand, eight hundred thirteen".