396969821815 has 48 divisors (see below), whose sum is σ = 558232432992. Its totient is φ = 270202576896.

The previous prime is 396969821791. The next prime is 396969821827. The reversal of 396969821815 is 518128969693.

It is not a de Polignac number, because 396969821815 - 2⁷ = 396969821687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22073107 + ... + 22091083.

It is an arithmetic number, because the mean of its divisors is an integer number (11629842354).

Almost surely, 2^396969821815 is an apocalyptic number.

396969821815 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

396969821815 is a deficient number, since it is larger than the sum of its proper divisors (161262611177).

396969821815 is a wasteful number, since it uses less digits than its factorization.

396969821815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18656 (or 18649 counting only the distinct ones).

The product of its digits is 50388480, while the sum is 67.

The spelling of 396969821815 in words is "three hundred ninety-six billion, nine hundred sixty-nine million, eight hundred twenty-one thousand, eight hundred fifteen".