997589190 has 128 divisors (see below), whose sum is σ = 2668256640. Its totient is φ = 237109248.

The previous prime is 997589179. The next prime is 997589213. The reversal of 997589190 is 91985799.

It is a super-2 number, since 2×997589190² = 1990368384009712200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 997589190.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3708376 + ... + 3708644.

It is an arithmetic number, because the mean of its divisors is an integer number (20845755).

Almost surely, 2^997589190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997589190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1334128320).

997589190 is an abundant number, since it is smaller than the sum of its proper divisors (1670667450).

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

997589190 is a wasteful number, since it uses less digits than its factorization.

997589190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586.

The product of its (nonzero) digits is 1837080, while the sum is 57.

The square root of 997589190 is about 31584.6353469531. The cubic root of 997589190 is about 999.1957500220.

The spelling of 997589190 in words is "nine hundred ninety-seven million, five hundred eighty-nine thousand, one hundred ninety".