997823200 has 144 divisors (see below), whose sum is σ = 2678734800. Its totient is φ = 359936000.

The previous prime is 997823179. The next prime is 997823221. The reversal of 997823200 is 2328799.

It is an interprime number because it is at equal distance from previous prime (997823179) and next prime (997823221).

It is a super-2 number, since 2×997823200² = 1991302276916480000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 1310820 + ... + 1311580.

It is an arithmetic number, because the mean of its divisors is an integer number (18602325).

Almost surely, 2^997823200 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 997823200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1339367400).

997823200 is an abundant number, since it is smaller than the sum of its proper divisors (1680911600).

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

997823200 is a wasteful number, since it uses less digits than its factorization.

997823200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941 (or 928 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 997823200 is about 31588.3396208158. The cubic root of 997823200 is about 999.2738728670.

The spelling of 997823200 in words is "nine hundred ninety-seven million, eight hundred twenty-three thousand, two hundred".