997399800 has 144 divisors (see below), whose sum is σ = 3359037240. Its totient is φ = 265224960.

The previous prime is 997399763. The next prime is 997399801. The reversal of 997399800 is 8993799.

It is a happy number.

It is a super-2 number, since 2×997399800² = 1989612722080080000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997399801) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 984094 + ... + 985106.

Almost surely, 2^997399800 is an apocalyptic number.

997399800 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

997399800 is the 18234-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997399800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1679518620).

997399800 is an abundant number, since it is smaller than the sum of its proper divisors (2361637440).

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

997399800 is a wasteful number, since it uses less digits than its factorization.

997399800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582 (or 1570 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 997399800 is about 31581.6370696644. The cubic root of 997399800 is about 999.1325143529.

The spelling of 997399800 in words is "nine hundred ninety-seven million, three hundred ninety-nine thousand, eight hundred".