397561560 has 64 divisors (see below), whose sum is σ = 1301114880. Its totient is φ = 96378240.

The previous prime is 397561547. The next prime is 397561561. The reversal of 397561560 is 65165793.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397561561) 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, 149272 + ... + 151911.

It is an arithmetic number, because the mean of its divisors is an integer number (20329920).

Almost surely, 2^397561560 is an apocalyptic number.

397561560 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

397561560 is an abundant number, since it is smaller than the sum of its proper divisors (903553320).

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

397561560 is a wasteful number, since it uses less digits than its factorization.

397561560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301208 (or 301204 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 42.

The square root of 397561560 is about 19938.9458096460. The cubic root of 397561560 is about 735.3060320303.

The spelling of 397561560 in words is "three hundred ninety-seven million, five hundred sixty-one thousand, five hundred sixty".