23681539 has 4 divisors (see below), whose sum is σ = 27064624. Its totient is φ = 20298456.

The previous prime is 23681531. The next prime is 23681549. The reversal of 23681539 is 93518632.

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 23681539 - 2³ = 23681531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23681498 and 23681507.

It is not an unprimeable number, because it can be changed into a prime (23681531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1691532 + ... + 1691545.

It is an arithmetic number, because the mean of its divisors is an integer number (6766156).

Almost surely, 2^23681539 is an apocalyptic number.

23681539 is a deficient number, since it is larger than the sum of its proper divisors (3383085).

23681539 is an equidigital number, since it uses as much as digits as its factorization.

23681539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3383084.

The product of its digits is 38880, while the sum is 37.

The square root of 23681539 is about 4866.3681529453. The cubic root of 23681539 is about 287.1683949866.

It can be divided in two parts, 2 and 3681539, that added together give a triangular number (3681541 = T₂₇₁₃).

The spelling of 23681539 in words is "twenty-three million, six hundred eighty-one thousand, five hundred thirty-nine".