997828 has 24 divisors (see below), whose sum is σ = 1944320. Its totient is φ = 444960.

The previous prime is 997813. The next prime is 997877. The reversal of 997828 is 828799.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 1303 + ... + 1921.

2⁹⁹⁷⁸²⁸ is an apocalyptic number.

It is an amenable number.

997828 is a deficient number, since it is larger than the sum of its proper divisors (946492).

997828 is a wasteful number, since it uses less digits than its factorization.

997828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667 (or 665 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 997828 is about 998.9134096607. The cubic root of 997828 is about 99.9275475191.

The spelling of 997828 in words is "nine hundred ninety-seven thousand, eight hundred twenty-eight".