23949981 has 12 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 14515080.

The previous prime is 23949973. The next prime is 23949983. The reversal of 23949981 is 18994932.

It is not a de Polignac number, because 23949981 - 2³ = 23949973 is a prime.

It is a super-2 number, since 2×23949981² = 1147203179800722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23949983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120861 + ... + 121058.

It is an arithmetic number, because the mean of its divisors is an integer number (3144960).

Almost surely, 2^23949981 is an apocalyptic number.

It is an amenable number.

23949981 is a deficient number, since it is larger than the sum of its proper divisors (13789539).

23949981 is a wasteful number, since it uses less digits than its factorization.

23949981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241936 (or 241933 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 23949981 is about 4893.8717800940. The cubic root of 23949981 is about 288.2493861294.

The spelling of 23949981 in words is "twenty-three million, nine hundred forty-nine thousand, nine hundred eighty-one".