997556 has 24 divisors (see below), whose sum is σ = 2083200. Its totient is φ = 408672.

The previous prime is 997553. The next prime is 997573. The reversal of 997556 is 655799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997553) by changing a digit.

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, 131 + ... + 1418.

It is an arithmetic number, because the mean of its divisors is an integer number (86800).

2⁹⁹⁷⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

997556 is an abundant number, since it is smaller than the sum of its proper divisors (1085644).

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

997556 is a wasteful number, since it uses less digits than its factorization.

997556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583 (or 1581 counting only the distinct ones).

The product of its digits is 85050, while the sum is 41.

The square root of 997556 is about 998.7772524442. Note that the first 3 decimals coincide. The cubic root of 997556 is about 99.9184668749.

The spelling of 997556 in words is "nine hundred ninety-seven thousand, five hundred fifty-six".