9915897 has 4 divisors (see below), whose sum is σ = 13221200. Its totient is φ = 6610596.

The previous prime is 9915887. The next prime is 9915907. The reversal of 9915897 is 7985199.

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: 7985199 = 3 ⋅2661733.

It is an interprime number because it is at equal distance from previous prime (9915887) and next prime (9915907).

It is not a de Polignac number, because 9915897 - 2⁴ = 9915881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9915817) 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, 1652647 + ... + 1652652.

It is an arithmetic number, because the mean of its divisors is an integer number (3305300).

Almost surely, 2^9915897 is an apocalyptic number.

It is an amenable number.

9915897 is a deficient number, since it is larger than the sum of its proper divisors (3305303).

9915897 is a wasteful number, since it uses less digits than its factorization.

9915897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305302.

The product of its digits is 204120, while the sum is 48.

The square root of 9915897 is about 3148.9517303382. The cubic root of 9915897 is about 214.8377864231.

The spelling of 9915897 in words is "nine million, nine hundred fifteen thousand, eight hundred ninety-seven".