23099999 has 4 divisors (see below), whose sum is σ = 24876936. Its totient is φ = 21323064.

The previous prime is 23099969. The next prime is 23100001. The reversal of 23099999 is 99999032.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23099999 - 2¹⁶ = 23034463 is a prime.

It is a Duffinian number.

23099999 is a modest number, since divided by 9999 gives 2309 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23099939) 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, 888449 + ... + 888474.

It is an arithmetic number, because the mean of its divisors is an integer number (6219234).

Almost surely, 2^23099999 is an apocalyptic number.

23099999 is a deficient number, since it is larger than the sum of its proper divisors (1776937).

23099999 is a wasteful number, since it uses less digits than its factorization.

23099999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776936.

The product of its (nonzero) digits is 354294, while the sum is 50.

The square root of 23099999 is about 4806.2458322479. The cubic root of 23099999 is about 284.7982526234.

The spelling of 23099999 in words is "twenty-three million, ninety-nine thousand, nine hundred ninety-nine".