99998865 has 24 divisors (see below), whose sum is σ = 177365760. Its totient is φ = 52091424.

The previous prime is 99998851. The next prime is 99998869. The reversal of 99998865 is 56889999.

It is not a de Polignac number, because 99998865 - 2⁸ = 99998609 is a prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99998869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23905 + ... + 27774.

It is an arithmetic number, because the mean of its divisors is an integer number (7390240).

Almost surely, 2^99998865 is an apocalyptic number.

It is an amenable number.

99998865 is a deficient number, since it is larger than the sum of its proper divisors (77366895).

99998865 is a wasteful number, since it uses less digits than its factorization.

99998865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51733 (or 51730 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 63.

The square root of 99998865 is about 9999.9432498390. The cubic root of 99998865 is about 464.1571272869.

The spelling of 99998865 in words is "ninety-nine million, nine hundred ninety-eight thousand, eight hundred sixty-five".