397313280 has 432 divisors, whose sum is σ = 1696356480. Its totient is φ = 83607552.

The previous prime is 397313263. The next prime is 397313303. The reversal of 397313280 is 82313793.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1048131 + ... + 1048509.

Almost surely, 2^397313280 is an apocalyptic number.

397313280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397313280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (848178240).

397313280 is an abundant number, since it is smaller than the sum of its proper divisors (1299043200).

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

397313280 is a wasteful number, since it uses less digits than its factorization.

397313280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 397313280 is about 19932.7188311078. The cubic root of 397313280 is about 735.1529322198.

The spelling of 397313280 in words is "three hundred ninety-seven million, three hundred thirteen thousand, two hundred eighty".