997228 has 18 divisors (see below), whose sum is σ = 1800708. Its totient is φ = 483120.

The previous prime is 997219. The next prime is 997247. The reversal of 997228 is 822799.

It is an unprimeable number.

997228 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 14851 + ... + 14917.

2⁹⁹⁷²²⁸ is an apocalyptic number.

It is an amenable number.

997228 is a deficient number, since it is larger than the sum of its proper divisors (803480).

997228 is a wasteful number, since it uses less digits than its factorization.

997228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 130 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 997228 is about 998.6130381684. The cubic root of 997228 is about 99.9075144907.

It can be divided in two parts, 9972 and 28, that added together give a 4-th power (10000 = 10⁴).

The spelling of 997228 in words is "nine hundred ninety-seven thousand, two hundred twenty-eight".