997898944 has 56 divisors (see below), whose sum is σ = 2281041920. Its totient is φ = 424279296.

The previous prime is 997898933. The next prime is 997898983. The reversal of 997898944 is 449898799.

It is a tau number, because it is divible by the number of its divisors (56).

It is a self number, because there is not a number n which added to its sum of digits gives 997898944.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48127 + ... + 65665.

Almost surely, 2^997898944 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 997898944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1140520960).

997898944 is an abundant number, since it is smaller than the sum of its proper divisors (1283142976).

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

997898944 is a wasteful number, since it uses less digits than its factorization.

997898944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17685 (or 17675 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 67.

The square root of 997898944 is about 31589.5385214789. The cubic root of 997898944 is about 999.2991569337.

The spelling of 997898944 in words is "nine hundred ninety-seven million, eight hundred ninety-eight thousand, nine hundred forty-four".