997880 has 64 divisors (see below), whose sum is σ = 2570400. Its totient is φ = 345600.

The previous prime is 997879. The next prime is 997889. The reversal of 997880 is 88799.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9830 + ... + 9930.

2⁹⁹⁷⁸⁸⁰ 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 997880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1285200).

997880 is an abundant number, since it is smaller than the sum of its proper divisors (1572520).

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

997880 is a wasteful number, since it uses less digits than its factorization.

997880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 997880 is about 998.9394376037. The cubic root of 997880 is about 99.9292833367.

The spelling of 997880 in words is "nine hundred ninety-seven thousand, eight hundred eighty".