997580 has 24 divisors (see below), whose sum is σ = 2163840. Its totient is φ = 385920.

The previous prime is 997573. The next prime is 997583. The reversal of 997580 is 85799.

997580 = 138² + 139² + ... + 177².

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (997583) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 185 + ... + 1424.

It is an arithmetic number, because the mean of its divisors is an integer number (90160).

2⁹⁹⁷⁵⁸⁰ is an apocalyptic number.

It is an amenable number.

997580 is an abundant number, since it is smaller than the sum of its proper divisors (1166260).

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

997580 is a wasteful number, since it uses less digits than its factorization.

997580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649 (or 1647 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 997580 is about 998.7892670629. The cubic root of 997580 is about 99.9192681746.

The spelling of 997580 in words is "nine hundred ninety-seven thousand, five hundred eighty".