23801999 has 4 divisors (see below), whose sum is σ = 25632936. Its totient is φ = 21971064.

The previous prime is 23801971. The next prime is 23802001. The reversal of 23801999 is 99910832.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23801999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23800999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915449 + ... + 915474.

It is an arithmetic number, because the mean of its divisors is an integer number (6408234).

Almost surely, 2^23801999 is an apocalyptic number.

23801999 is a deficient number, since it is larger than the sum of its proper divisors (1830937).

23801999 is a wasteful number, since it uses less digits than its factorization.

23801999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830936.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 23801999 is about 4878.7292402838. The cubic root of 23801999 is about 287.6544813135.

The spelling of 23801999 in words is "twenty-three million, eight hundred one thousand, nine hundred ninety-nine".