997697 has 4 divisors (see below), whose sum is σ = 1012656. Its totient is φ = 982740.

The previous prime is 997693. The next prime is 997699. The reversal of 997697 is 796799.

997697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 997697 - 2² = 997693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997693) 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, 7379 + ... + 7512.

It is an arithmetic number, because the mean of its divisors is an integer number (253164).

2⁹⁹⁷⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

997697 is a deficient number, since it is larger than the sum of its proper divisors (14959).

997697 is a wasteful number, since it uses less digits than its factorization.

997697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14958.

The product of its digits is 214326, while the sum is 47.

The square root of 997697 is about 998.8478362594. The cubic root of 997697 is about 99.9231743266.

The spelling of 997697 in words is "nine hundred ninety-seven thousand, six hundred ninety-seven".