396776813 has 4 divisors (see below), whose sum is σ = 396897888. Its totient is φ = 396655740.

The previous prime is 396776801. The next prime is 396776839. The reversal of 396776813 is 318677693.

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 a de Polignac number, because none of the positive numbers 2^k-396776813 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 (396776873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55481 + ... + 62222.

It is an arithmetic number, because the mean of its divisors is an integer number (99224472).

Almost surely, 2^396776813 is an apocalyptic number.

It is an amenable number.

396776813 is a deficient number, since it is larger than the sum of its proper divisors (121075).

396776813 is a wasteful number, since it uses less digits than its factorization.

396776813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121074.

The product of its digits is 1143072, while the sum is 50.

The square root of 396776813 is about 19919.2573405737. The cubic root of 396776813 is about 734.8219063470.

The spelling of 396776813 in words is "three hundred ninety-six million, seven hundred seventy-six thousand, eight hundred thirteen".