997998984 has 48 divisors (see below), whose sum is σ = 2705140620. Its totient is φ = 332392320.

The previous prime is 997998973. The next prime is 997999001. The reversal of 997998984 is 489899799.

It can be written as a sum of positive squares in 2 ways, for example, as 986588100 + 11410884 = 31410^2 + 3378^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94414 + ... + 104450.

Almost surely, 2^997998984 is an apocalyptic number.

It is an amenable number.

997998984 is an abundant number, since it is smaller than the sum of its proper divisors (1707141636).

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

997998984 is a wasteful number, since it uses less digits than its factorization.

997998984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11430 (or 11423 counting only the distinct ones).

The product of its digits is 105815808, while the sum is 72.

The square root of 997998984 is about 31591.1219173995. The cubic root of 997998984 is about 999.3325492753.

The spelling of 997998984 in words is "nine hundred ninety-seven million, nine hundred ninety-eight thousand, nine hundred eighty-four".