23905894399 has 4 divisors (see below), whose sum is σ = 24945281136. Its totient is φ = 22866507664.

The previous prime is 23905894381. The next prime is 23905894429. The reversal of 23905894399 is 99349850932.

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 23905894399 - 2¹⁷ = 23905763327 is a prime.

It is a super-2 number, since 2×23905894399² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23905894499) 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, 519693334 + ... + 519693379.

It is an arithmetic number, because the mean of its divisors is an integer number (6236320284).

Almost surely, 2^23905894399 is an apocalyptic number.

23905894399 is a deficient number, since it is larger than the sum of its proper divisors (1039386737).

23905894399 is a wasteful number, since it uses less digits than its factorization.

23905894399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039386736.

The product of its (nonzero) digits is 18895680, while the sum is 61.

The spelling of 23905894399 in words is "twenty-three billion, nine hundred five million, eight hundred ninety-four thousand, three hundred ninety-nine".