9997897 has 16 divisors (see below), whose sum is σ = 12393472. Its totient is φ = 7853760.

The previous prime is 9997879. The next prime is 9997913. The reversal of 9997897 is 7987999.

It is a cyclic number.

It is not a de Polignac number, because 9997897 - 2¹¹ = 9995849 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16168 + ... + 16774.

It is an arithmetic number, because the mean of its divisors is an integer number (774592).

Almost surely, 2^9997897 is an apocalyptic number.

It is an amenable number.

9997897 is a deficient number, since it is larger than the sum of its proper divisors (2395575).

9997897 is a wasteful number, since it uses less digits than its factorization.

9997897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808.

The product of its digits is 2571912, while the sum is 58.

The square root of 9997897 is about 3161.9451291887. The cubic root of 9997897 is about 215.4283653572.

The spelling of 9997897 in words is "nine million, nine hundred ninety-seven thousand, eight hundred ninety-seven".