997656 has 32 divisors (see below), whose sum is σ = 2721600. Its totient is φ = 302240.

The previous prime is 997651. The next prime is 997663. The reversal of 997656 is 656799.

997656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1626 + ... + 2153.

It is an arithmetic number, because the mean of its divisors is an integer number (85050).

2⁹⁹⁷⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

997656 is an abundant number, since it is smaller than the sum of its proper divisors (1723944).

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

997656 is a wasteful number, since it uses less digits than its factorization.

997656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3799 (or 3795 counting only the distinct ones).

The product of its digits is 102060, while the sum is 42.

The square root of 997656 is about 998.8273124019. The cubic root of 997656 is about 99.9218055389.

It can be divided in two parts, 997 and 656, that added together give a triangular number (1653 = T₅₇).

The spelling of 997656 in words is "nine hundred ninety-seven thousand, six hundred fifty-six".