23981739 has 4 divisors (see below), whose sum is σ = 31975656. Its totient is φ = 15987824.

The previous prime is 23981731. The next prime is 23981759. The reversal of 23981739 is 93718932.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23981739 - 2³ = 23981731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23981739.

It is not an unprimeable number, because it can be changed into a prime (23981731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3996954 + ... + 3996959.

It is an arithmetic number, because the mean of its divisors is an integer number (7993914).

Almost surely, 2^23981739 is an apocalyptic number.

23981739 is a deficient number, since it is larger than the sum of its proper divisors (7993917).

23981739 is an equidigital number, since it uses as much as digits as its factorization.

23981739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7993916.

The product of its digits is 81648, while the sum is 42.

The square root of 23981739 is about 4897.1153754021. The cubic root of 23981739 is about 288.3767373895.

The spelling of 23981739 in words is "twenty-three million, nine hundred eighty-one thousand, seven hundred thirty-nine".