397831580 has 12 divisors (see below), whose sum is σ = 835446360. Its totient is φ = 159132624.

The previous prime is 397831573. The next prime is 397831589. The reversal of 397831580 is 85138793.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397831589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9945770 + ... + 9945809.

It is an arithmetic number, because the mean of its divisors is an integer number (69620530).

Almost surely, 2^397831580 is an apocalyptic number.

It is an amenable number.

397831580 is an abundant number, since it is smaller than the sum of its proper divisors (437614780).

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

397831580 is a wasteful number, since it uses less digits than its factorization.

397831580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19891588 (or 19891586 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 397831580 is about 19945.7158307242. The cubic root of 397831580 is about 735.4724652918.

The spelling of 397831580 in words is "three hundred ninety-seven million, eight hundred thirty-one thousand, five hundred eighty".