23847981 has 4 divisors (see below), whose sum is σ = 31797312. Its totient is φ = 15898652.

The previous prime is 23847979. The next prime is 23847997. The reversal of 23847981 is 18974832.

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 23847981 - 2¹ = 23847979 is a prime.

It is a super-2 number, since 2×23847981² = 1137452395552722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23847931) 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, 3974661 + ... + 3974666.

It is an arithmetic number, because the mean of its divisors is an integer number (7949328).

Almost surely, 2^23847981 is an apocalyptic number.

It is an amenable number.

23847981 is a deficient number, since it is larger than the sum of its proper divisors (7949331).

23847981 is an equidigital number, since it uses as much as digits as its factorization.

23847981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7949330.

The product of its digits is 96768, while the sum is 42.

The square root of 23847981 is about 4883.4394641482. The cubic root of 23847981 is about 287.8395976979.

The spelling of 23847981 in words is "twenty-three million, eight hundred forty-seven thousand, nine hundred eighty-one".