23990 has 8 divisors (see below), whose sum is σ = 43200. Its totient is φ = 9592.

The previous prime is 23981. The next prime is 23993. The reversal of 23990 is 9932.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23993) 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, 1190 + ... + 1209.

It is an arithmetic number, because the mean of its divisors is an integer number (5400).

2²³⁹⁹⁰ is an apocalyptic number.

23990 is a deficient number, since it is larger than the sum of its proper divisors (19210).

23990 is a wasteful number, since it uses less digits than its factorization.

23990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 23990 is about 154.8870556244. The cubic root of 23990 is about 28.8409846008.

The spelling of 23990 in words is "twenty-three thousand, nine hundred ninety".