9889915 has 24 divisors (see below), whose sum is σ = 14191632. Its totient is φ = 6592320.

The previous prime is 9889909. The next prime is 9889921. The reversal of 9889915 is 5199889.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (9889909) and next prime (9889921).

It is not a de Polignac number, because 9889915 - 2¹⁵ = 9857147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8520 + ... + 9610.

It is an arithmetic number, because the mean of its divisors is an integer number (591318).

Almost surely, 2^9889915 is an apocalyptic number.

9889915 is a deficient number, since it is larger than the sum of its proper divisors (4301717).

9889915 is a wasteful number, since it uses less digits than its factorization.

9889915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147 (or 1140 counting only the distinct ones).

The product of its digits is 233280, while the sum is 49.

The square root of 9889915 is about 3144.8235244605. The cubic root of 9889915 is about 214.6499803245.

The spelling of 9889915 in words is "nine million, eight hundred eighty-nine thousand, nine hundred fifteen".