997816 has 16 divisors (see below), whose sum is σ = 1922040. Its totient is φ = 485280.

The previous prime is 997813. The next prime is 997877. The reversal of 997816 is 618799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1390 + ... + 1981.

2⁹⁹⁷⁸¹⁶ is an apocalyptic number.

It is an amenable number.

997816 is a deficient number, since it is larger than the sum of its proper divisors (924224).

997816 is a wasteful number, since it uses less digits than its factorization.

997816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414 (or 3410 counting only the distinct ones).

The product of its digits is 27216, while the sum is 40.

The square root of 997816 is about 998.9074031160. The cubic root of 997816 is about 99.9271469372.

The spelling of 997816 in words is "nine hundred ninety-seven thousand, eight hundred sixteen".