1997589168 has 120 divisors (see below), whose sum is σ = 6051956400. Its totient is φ = 630768384.

The previous prime is 1997589161. The next prime is 1997589197. The reversal of 1997589168 is 8619857991.

It is a super-2 number, since 2×1997589168² = 7980724968221864448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1997589161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149548 + ... + 162356.

It is an arithmetic number, because the mean of its divisors is an integer number (50432970).

Almost surely, 2^1997589168 is an apocalyptic number.

1997589168 is a gapful number since it is divisible by the number (18) 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 1997589168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3025978200).

1997589168 is an abundant number, since it is smaller than the sum of its proper divisors (4054367232).

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

1997589168 is a wasteful number, since it uses less digits than its factorization.

1997589168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12864 (or 12833 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 63.

The square root of 1997589168 is about 44694.3975012529. The cubic root of 1997589168 is about 1259.4146033500.

The spelling of 1997589168 in words is "one billion, nine hundred ninety-seven million, five hundred eighty-nine thousand, one hundred sixty-eight".