23724981 has 20 divisors (see below), whose sum is σ = 40504992. Its totient is φ = 13556808.

The previous prime is 23724971. The next prime is 23724991. The reversal of 23724981 is 18942732.

It is an interprime number because it is at equal distance from previous prime (23724971) and next prime (23724991).

It is not a de Polignac number, because 23724981 - 2¹³ = 23716789 is a prime.

It is a super-2 number, since 2×23724981² = 1125749446900722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23724931) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20355 + ... + 21488.

Almost surely, 2^23724981 is an apocalyptic number.

23724981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23724981 is a deficient number, since it is larger than the sum of its proper divisors (16780011).

23724981 is an equidigital number, since it uses as much as digits as its factorization.

23724981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41862 (or 41853 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 23724981 is about 4870.8296007970. The cubic root of 23724981 is about 287.3438839885.

The spelling of 23724981 in words is "twenty-three million, seven hundred twenty-four thousand, nine hundred eighty-one".