997800 has 48 divisors (see below), whose sum is σ = 3095040. Its totient is φ = 265920.

The previous prime is 997793. The next prime is 997807. The reversal of 997800 is 8799.

It is an interprime number because it is at equal distance from previous prime (997793) and next prime (997807).

It is not an unprimeable number, because it can be changed into a prime (997807) by changing a digit.

997800 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232 + ... + 1431.

It is an arithmetic number, because the mean of its divisors is an integer number (64480).

2⁹⁹⁷⁸⁰⁰ 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 997800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1547520).

997800 is an abundant number, since it is smaller than the sum of its proper divisors (2097240).

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

997800 is a wasteful number, since it uses less digits than its factorization.

997800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682 (or 1673 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 997800 is about 998.8993943336. The cubic root of 997800 is about 99.9266128231.

The spelling of 997800 in words is "nine hundred ninety-seven thousand, eight hundred".