397031880 has 256 divisors, whose sum is σ = 1430323200. Its totient is φ = 86261760.

The previous prime is 397031879. The next prime is 397031881. The reversal of 397031880 is 88130793.

It is an interprime number because it is at equal distance from previous prime (397031879) and next prime (397031881).

It is not an unprimeable number, because it can be changed into a prime (397031881) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2057064 + ... + 2057256.

It is an arithmetic number, because the mean of its divisors is an integer number (5587200).

Almost surely, 2^397031880 is an apocalyptic number.

397031880 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 397031880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (715161600).

397031880 is an abundant number, since it is smaller than the sum of its proper divisors (1033291320).

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

397031880 is a wasteful number, since it uses less digits than its factorization.

397031880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 397031880 is about 19925.6588347788. The cubic root of 397031880 is about 734.9793321043.

The spelling of 397031880 in words is "three hundred ninety-seven million, thirty-one thousand, eight hundred eighty".