997508 has 6 divisors (see below), whose sum is σ = 1745646. Its totient is φ = 498752.

The previous prime is 997463. The next prime is 997511. The reversal of 997508 is 805799.

It can be written as a sum of positive squares in only one way, i.e., 906304 + 91204 = 952^2 + 302^2 .

It is an unprimeable number.

997508 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124685 + ... + 124692.

It is an arithmetic number, because the mean of its divisors is an integer number (290941).

2⁹⁹⁷⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

997508 is a deficient number, since it is larger than the sum of its proper divisors (748138).

997508 is a wasteful number, since it uses less digits than its factorization.

997508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249381 (or 249379 counting only the distinct ones).

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

The square root of 997508 is about 998.7532227733. The cubic root of 997508 is about 99.9168642369.

The spelling of 997508 in words is "nine hundred ninety-seven thousand, five hundred eight".