9897917 has 4 divisors (see below), whose sum is σ = 10418880. Its totient is φ = 9376956.

The previous prime is 9897913. The next prime is 9897919. The reversal of 9897917 is 7197989.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7197989 = 2579 ⋅2791.

It is not a de Polignac number, because 9897917 - 2² = 9897913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9897913) 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, 260453 + ... + 260490.

It is an arithmetic number, because the mean of its divisors is an integer number (2604720).

Almost surely, 2^9897917 is an apocalyptic number.

It is an amenable number.

9897917 is a deficient number, since it is larger than the sum of its proper divisors (520963).

9897917 is a wasteful number, since it uses less digits than its factorization.

9897917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520962.

The product of its digits is 285768, while the sum is 50.

The square root of 9897917 is about 3146.0955166682. The cubic root of 9897917 is about 214.7078563225.

The spelling of 9897917 in words is "nine million, eight hundred ninety-seven thousand, nine hundred seventeen".