397216556 has 48 divisors (see below), whose sum is σ = 785998080. Its totient is φ = 174083520.

The previous prime is 397216553. The next prime is 397216559. The reversal of 397216556 is 655612793.

It is an interprime number because it is at equal distance from previous prime (397216553) and next prime (397216559).

It is a super-2 number, since 2×397216556² = 315561984721002272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (397216553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136145 + ... + 139031.

It is an arithmetic number, because the mean of its divisors is an integer number (16374960).

Almost surely, 2^397216556 is an apocalyptic number.

It is an amenable number.

397216556 is a deficient number, since it is larger than the sum of its proper divisors (388781524).

397216556 is a wasteful number, since it uses less digits than its factorization.

397216556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014 (or 3012 counting only the distinct ones).

The product of its digits is 340200, while the sum is 44.

The square root of 397216556 is about 19930.2924213369. The cubic root of 397216556 is about 735.0932709006.

The spelling of 397216556 in words is "three hundred ninety-seven million, two hundred sixteen thousand, five hundred fifty-six".