397797980 has 12 divisors (see below), whose sum is σ = 835375800. Its totient is φ = 159119184.

The previous prime is 397797979. The next prime is 397798033. The reversal of 397797980 is 89797793.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9944930 + ... + 9944969.

It is an arithmetic number, because the mean of its divisors is an integer number (69614650).

Almost surely, 2^397797980 is an apocalyptic number.

It is an amenable number.

397797980 is an abundant number, since it is smaller than the sum of its proper divisors (437577820).

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

397797980 is a wasteful number, since it uses less digits than its factorization.

397797980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19889908 (or 19889906 counting only the distinct ones).

The product of its (nonzero) digits is 6001128, while the sum is 59.

The square root of 397797980 is about 19944.8735267988. The cubic root of 397797980 is about 735.4517592344.

The spelling of 397797980 in words is "three hundred ninety-seven million, seven hundred ninety-seven thousand, nine hundred eighty".