23805981 has 12 divisors (see below), whose sum is σ = 35660352. Its totient is φ = 15870492.

The previous prime is 23805973. The next prime is 23806009. The reversal of 23805981 is 18950832.

It is not a de Polignac number, because 23805981 - 2³ = 23805973 is a prime.

It is a super-2 number, since 2×23805981² = 1133449462744722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23805931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48741 + ... + 49226.

It is an arithmetic number, because the mean of its divisors is an integer number (2971696).

Almost surely, 2^23805981 is an apocalyptic number.

It is an amenable number.

23805981 is a deficient number, since it is larger than the sum of its proper divisors (11854371).

23805981 is an frugal number, since it uses more digits than its factorization.

23805981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97982 (or 97970 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 23805981 is about 4879.1373212895. The cubic root of 23805981 is about 287.6705216507.

The spelling of 23805981 in words is "twenty-three million, eight hundred five thousand, nine hundred eighty-one".