397111880 has 128 divisors (see below), whose sum is σ = 1011225600. Its totient is φ = 139104000.

The previous prime is 397111873. The next prime is 397111903. The reversal of 397111880 is 88111793.

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, 2629805 + ... + 2629955.

It is an arithmetic number, because the mean of its divisors is an integer number (7900200).

Almost surely, 2^397111880 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 397111880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (505612800).

397111880 is an abundant number, since it is smaller than the sum of its proper divisors (614113720).

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

397111880 is a wasteful number, since it uses less digits than its factorization.

397111880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 38.

The square root of 397111880 is about 19927.6661955182. Note that the first 3 decimals coincide. The cubic root of 397111880 is about 735.0286937138.

It can be divided in two parts, 3971 and 11880, that added together give a palindrome (15851).

The spelling of 397111880 in words is "three hundred ninety-seven million, one hundred eleven thousand, eight hundred eighty".