997842 has 16 divisors (see below), whose sum is σ = 2100960. Its totient is φ = 315072.

The previous prime is 997813. The next prime is 997877. The reversal of 997842 is 248799.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 997842.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 997842.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4263 + ... + 4490.

It is an arithmetic number, because the mean of its divisors is an integer number (131310).

2⁹⁹⁷⁸⁴² is an apocalyptic number.

997842 is an abundant number, since it is smaller than the sum of its proper divisors (1103118).

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

997842 is a wasteful number, since it uses less digits than its factorization.

997842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8777.

The product of its digits is 36288, while the sum is 39.

The square root of 997842 is about 998.9204172505. The cubic root of 997842 is about 99.9280148605.

The spelling of 997842 in words is "nine hundred ninety-seven thousand, eight hundred forty-two".