397563660 has 96 divisors (see below), whose sum is σ = 1332031680. Its totient is φ = 97860096.

The previous prime is 397563637. The next prime is 397563667. The reversal of 397563660 is 66365793.

397563660 is a `hidden beast` number, since 3 + 9 + 7 + 5 + 636 + 6 + 0 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (397563667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21297 + ... + 35336.

It is an arithmetic number, because the mean of its divisors is an integer number (13875330).

Almost surely, 2^397563660 is an apocalyptic number.

397563660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

397563660 is an abundant number, since it is smaller than the sum of its proper divisors (934468020).

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

397563660 is a wasteful number, since it uses less digits than its factorization.

397563660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56664 (or 56656 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 45.

The square root of 397563660 is about 19938.9984703345. The cubic root of 397563660 is about 735.3073267061.

The spelling of 397563660 in words is "three hundred ninety-seven million, five hundred sixty-three thousand, six hundred sixty".