396931556 has 36 divisors (see below), whose sum is σ = 810469548. Its totient is φ = 169602048.

The previous prime is 396931553. The next prime is 396931573. The reversal of 396931556 is 655139693.

It can be written as a sum of positive squares in 2 ways, for example, as 58003456 + 338928100 = 7616^2 + 18410^2 .

It is a super-2 number, since 2×396931556² = 315109320297162272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 396931556.

It is not an unprimeable number, because it can be changed into a prime (396931553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66320 + ... + 72056.

It is an arithmetic number, because the mean of its divisors is an integer number (22513043).

Almost surely, 2^396931556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 396931556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (405234774).

396931556 is an abundant number, since it is smaller than the sum of its proper divisors (413537992).

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

396931556 is a wasteful number, since it uses less digits than its factorization.

396931556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6108 (or 6099 counting only the distinct ones).

The product of its digits is 656100, while the sum is 47.

The square root of 396931556 is about 19923.1412181915. The cubic root of 396931556 is about 734.9174208055.

The spelling of 396931556 in words is "three hundred ninety-six million, nine hundred thirty-one thousand, five hundred fifty-six".