23981663 has 4 divisors (see below), whose sum is σ = 25024368. Its totient is φ = 22938960.

The previous prime is 23981647. The next prime is 23981687. The reversal of 23981663 is 36618932.

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 23981663 - 2⁴ = 23981647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23981623) 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, 521318 + ... + 521363.

It is an arithmetic number, because the mean of its divisors is an integer number (6256092).

Almost surely, 2^23981663 is an apocalyptic number.

23981663 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

23981663 is a deficient number, since it is larger than the sum of its proper divisors (1042705).

23981663 is a wasteful number, since it uses less digits than its factorization.

23981663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042704.

The product of its digits is 46656, while the sum is 38.

The square root of 23981663 is about 4897.1076157258. The cubic root of 23981663 is about 288.3764327597.

The spelling of 23981663 in words is "twenty-three million, nine hundred eighty-one thousand, six hundred sixty-three".