23942909 has 4 divisors (see below), whose sum is σ = 24394716. Its totient is φ = 23491104.

The previous prime is 23942903. The next prime is 23942911. The reversal of 23942909 is 90924932.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21883684 + 2059225 = 4678^2 + 1435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23942909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23942903) 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, 225824 + ... + 225929.

It is an arithmetic number, because the mean of its divisors is an integer number (6098679).

Almost surely, 2^23942909 is an apocalyptic number.

It is an amenable number.

23942909 is a deficient number, since it is larger than the sum of its proper divisors (451807).

23942909 is an equidigital number, since it uses as much as digits as its factorization.

23942909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451806.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 23942909 is about 4893.1491904498. The cubic root of 23942909 is about 288.2210117111.

The spelling of 23942909 in words is "twenty-three million, nine hundred forty-two thousand, nine hundred nine".