396684815 has 4 divisors (see below), whose sum is σ = 476021784. Its totient is φ = 317347848.

The previous prime is 396684811. The next prime is 396684857. The reversal of 396684815 is 518486693.

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

It is a cyclic number.

It is not a de Polignac number, because 396684815 - 2² = 396684811 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 (396684811) 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, 39668477 + ... + 39668486.

It is an arithmetic number, because the mean of its divisors is an integer number (119005446).

Almost surely, 2^396684815 is an apocalyptic number.

396684815 is a deficient number, since it is larger than the sum of its proper divisors (79336969).

396684815 is an equidigital number, since it uses as much as digits as its factorization.

396684815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79336968.

The product of its digits is 1244160, while the sum is 50.

The square root of 396684815 is about 19916.9479338577. The cubic root of 396684815 is about 734.7651092014.

The spelling of 396684815 in words is "three hundred ninety-six million, six hundred eighty-four thousand, eight hundred fifteen".