396844813 has 8 divisors (see below), whose sum is σ = 400798008. Its totient is φ = 392899584.

The previous prime is 396844741. The next prime is 396844841. The reversal of 396844813 is 318448693.

It can be written as a sum of positive squares in 4 ways, for example, as 161467849 + 235376964 = 12707^2 + 15342^2 .

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-396844813 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 (396844843) 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, 162981 + ... + 165397.

It is an arithmetic number, because the mean of its divisors is an integer number (50099751).

Almost surely, 2^396844813 is an apocalyptic number.

It is an amenable number.

396844813 is a deficient number, since it is larger than the sum of its proper divisors (3953195).

396844813 is a wasteful number, since it uses less digits than its factorization.

396844813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3983.

The product of its digits is 497664, while the sum is 46.

The square root of 396844813 is about 19920.9641583935. The cubic root of 396844813 is about 734.8638821159.

The spelling of 396844813 in words is "three hundred ninety-six million, eight hundred forty-four thousand, eight hundred thirteen".