396915220 has 24 divisors (see below), whose sum is σ = 897639624. Its totient is φ = 146553216.

The previous prime is 396915217. The next prime is 396915221. The reversal of 396915220 is 22519693.

It can be written as a sum of positive squares in 4 ways, for example, as 69956496 + 326958724 = 8364^2 + 18082^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 396915220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396915221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 763039 + ... + 763558.

It is an arithmetic number, because the mean of its divisors is an integer number (37401651).

Almost surely, 2^396915220 is an apocalyptic number.

It is an amenable number.

396915220 is an abundant number, since it is smaller than the sum of its proper divisors (500724404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

396915220 is a wasteful number, since it uses less digits than its factorization.

396915220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526619 (or 1526617 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 396915220 is about 19922.7312384623. The cubic root of 396915220 is about 734.9073386511.

The spelling of 396915220 in words is "three hundred ninety-six million, nine hundred fifteen thousand, two hundred twenty".