23743981 has 4 divisors (see below), whose sum is σ = 24776352. Its totient is φ = 22711612.

The previous prime is 23743969. The next prime is 23743987. The reversal of 23743981 is 18934732.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23743981 - 2¹⁵ = 23711213 is a prime.

It is a super-2 number, since 2×23743981² = 1127553267456722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23743981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23743987) 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, 516151 + ... + 516196.

It is an arithmetic number, because the mean of its divisors is an integer number (6194088).

Almost surely, 2^23743981 is an apocalyptic number.

It is an amenable number.

23743981 is a deficient number, since it is larger than the sum of its proper divisors (1032371).

23743981 is a wasteful number, since it uses less digits than its factorization.

23743981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032370.

The product of its digits is 36288, while the sum is 37.

The square root of 23743981 is about 4872.7795969036. The cubic root of 23743981 is about 287.4205693612.

Subtracting from 23743981 its reverse (18934732), we obtain a square (4809249 = 2193²).

The spelling of 23743981 in words is "twenty-three million, seven hundred forty-three thousand, nine hundred eighty-one".