997999900 has 72 divisors (see below), whose sum is σ = 2312601984. Its totient is φ = 372926400.

The previous prime is 997999879. The next prime is 997999931. The reversal of 997999900 is 9999799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93855 + ... + 103945.

It is an arithmetic number, because the mean of its divisors is an integer number (32119472).

Almost surely, 2^997999900 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 997999900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1156300992).

997999900 is an abundant number, since it is smaller than the sum of its proper divisors (1314602084).

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

997999900 is a wasteful number, since it uses less digits than its factorization.

997999900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10171 (or 10164 counting only the distinct ones).

The product of its (nonzero) digits is 3720087, while the sum is 61.

The square root of 997999900 is about 31591.1364151402. The cubic root of 997999900 is about 999.3328550165.

It can be divided in two parts, 997999 and 900, that added together give a palindrome (998899).

The spelling of 997999900 in words is "nine hundred ninety-seven million, nine hundred ninety-nine thousand, nine hundred".