997504 has 16 divisors (see below), whose sum is σ = 1987470. Its totient is φ = 498688.

The previous prime is 997463. The next prime is 997511. The reversal of 997504 is 405799.

997504 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in only one way, i.e., 577600 + 419904 = 760^2 + 648^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 997504.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3769 + ... + 4024.

2⁹⁹⁷⁵⁰⁴ is an apocalyptic number.

It is an amenable number.

997504 is a deficient number, since it is larger than the sum of its proper divisors (989966).

997504 is an equidigital number, since it uses as much as digits as its factorization.

997504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7807 (or 7795 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 997504 is about 998.7512202746. The cubic root of 997504 is about 99.9167306815.

The spelling of 997504 in words is "nine hundred ninety-seven thousand, five hundred four".