997188 has 24 divisors (see below), whose sum is σ = 2428608. Its totient is φ = 317856.

The previous prime is 997163. The next prime is 997201. The reversal of 997188 is 881799.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 997188.

It is an unprimeable number.

997188 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1531 + ... + 2082.

It is an arithmetic number, because the mean of its divisors is an integer number (101192).

2⁹⁹⁷¹⁸⁸ is an apocalyptic number.

It is an amenable number.

997188 is an abundant number, since it is smaller than the sum of its proper divisors (1431420).

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

997188 is a wasteful number, since it uses less digits than its factorization.

997188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643 (or 3641 counting only the distinct ones).

The product of its digits is 36288, while the sum is 42.

The square root of 997188 is about 998.5930101898. The cubic root of 997188 is about 99.9061786698.

The spelling of 997188 in words is "nine hundred ninety-seven thousand, one hundred eighty-eight".