405812813 has 16 divisors (see below), whose sum is σ = 470776320. Its totient is φ = 342622896.

The previous prime is 405812807. The next prime is 405812821. The reversal of 405812813 is 318218504.

It is not a de Polignac number, because 405812813 - 2⁸ = 405812557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 405812813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405812833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242606 + ... + 244272.

It is an arithmetic number, because the mean of its divisors is an integer number (29423520).

Almost surely, 2^405812813 is an apocalyptic number.

It is an amenable number.

405812813 is a deficient number, since it is larger than the sum of its proper divisors (64963507).

405812813 is a wasteful number, since it uses less digits than its factorization.

405812813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 405812813 is about 20144.7961766805. The cubic root of 405812813 is about 740.3582469183.

The spelling of 405812813 in words is "four hundred five million, eight hundred twelve thousand, eight hundred thirteen".