397439980 has 72 divisors (see below), whose sum is σ = 985542768. Its totient is φ = 134209152.

The previous prime is 397439969. The next prime is 397440011. The reversal of 397439980 is 89934793.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62634 + ... + 68686.

It is an arithmetic number, because the mean of its divisors is an integer number (13688094).

Almost surely, 2^397439980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397439980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492771384).

397439980 is an abundant number, since it is smaller than the sum of its proper divisors (588102788).

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

397439980 is a wasteful number, since it uses less digits than its factorization.

397439980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6143 (or 6134 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 52.

The square root of 397439980 is about 19935.8967693957. The cubic root of 397439980 is about 735.2310686946.

The spelling of 397439980 in words is "three hundred ninety-seven million, four hundred thirty-nine thousand, nine hundred eighty".