9998865 has 12 divisors (see below), whose sum is σ = 17331444. Its totient is φ = 5332704.

The previous prime is 9998861. The next prime is 9998867. The reversal of 9998865 is 5688999.

It can be written as a sum of positive squares in 2 ways, for example, as 6671889 + 3326976 = 2583^2 + 1824^2 .

It is not a de Polignac number, because 9998865 - 2² = 9998861 is a prime.

9998865 is a lucky number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9998861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111054 + ... + 111143.

It is an arithmetic number, because the mean of its divisors is an integer number (1444287).

Almost surely, 2^9998865 is an apocalyptic number.

It is an amenable number.

9998865 is a deficient number, since it is larger than the sum of its proper divisors (7332579).

9998865 is a wasteful number, since it uses less digits than its factorization.

9998865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222208 (or 222205 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The square root of 9998865 is about 3162.0981958187. The cubic root of 9998865 is about 215.4353177502.

The spelling of 9998865 in words is "nine million, nine hundred ninety-eight thousand, eight hundred sixty-five".