397647880 has 128 divisors (see below), whose sum is σ = 1061786880. Its totient is φ = 131189760.

The previous prime is 397647869. The next prime is 397647893. The reversal of 397647880 is 88746793.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1357014 + ... + 1357306.

It is an arithmetic number, because the mean of its divisors is an integer number (8295210).

Almost surely, 2^397647880 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 397647880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (530893440).

397647880 is an abundant number, since it is smaller than the sum of its proper divisors (664139000).

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

397647880 is a wasteful number, since it uses less digits than its factorization.

397647880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 52.

The square root of 397647880 is about 19941.1103000811. The cubic root of 397647880 is about 735.3592456119.

The spelling of 397647880 in words is "three hundred ninety-seven million, six hundred forty-seven thousand, eight hundred eighty".