23990489857 has 4 divisors (see below), whose sum is σ = 24124515120. Its totient is φ = 23856464596.

The previous prime is 23990489849. The next prime is 23990489863. The reversal of 23990489857 is 75898409932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23990489857 - 2³ = 23990489849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23990409857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67012363 + ... + 67012720.

It is an arithmetic number, because the mean of its divisors is an integer number (6031128780).

Almost surely, 2^23990489857 is an apocalyptic number.

It is an amenable number.

23990489857 is a deficient number, since it is larger than the sum of its proper divisors (134025263).

23990489857 is a wasteful number, since it uses less digits than its factorization.

23990489857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134025262.

The product of its (nonzero) digits is 39191040, while the sum is 64.

The spelling of 23990489857 in words is "twenty-three billion, nine hundred ninety million, four hundred eighty-nine thousand, eight hundred fifty-seven".