997989800 has 24 divisors (see below), whose sum is σ = 2320326750. Its totient is φ = 399195840.

The previous prime is 997989793. The next prime is 997989821. The reversal of 997989800 is 8989799.

It can be written as a sum of positive squares in 3 ways, for example, as 475501636 + 522488164 = 21806^2 + 22858^2 .

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 997989800.

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 5 ways as a sum of consecutive naturals, for example, 2494775 + ... + 2495174.

Almost surely, 2^997989800 is an apocalyptic number.

It is an amenable number.

997989800 is an abundant number, since it is smaller than the sum of its proper divisors (1322336950).

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

997989800 is a wasteful number, since it uses less digits than its factorization.

997989800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4989965 (or 4989956 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 59.

The square root of 997989800 is about 31590.9765597710. The cubic root of 997989800 is about 999.3294838419.

The spelling of 997989800 in words is "nine hundred ninety-seven million, nine hundred eighty-nine thousand, eight hundred".