23090909 has 4 divisors (see below), whose sum is σ = 24306240. Its totient is φ = 21875580.

The previous prime is 23090897. The next prime is 23090917. The reversal of 23090909 is 90909032.

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 23090909 - 2²⁴ = 6313693 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

23090909 is a modest number, since divided by 90909 gives 23 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23090929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607637 + ... + 607674.

It is an arithmetic number, because the mean of its divisors is an integer number (6076560).

Almost surely, 2^23090909 is an apocalyptic number.

It is an amenable number.

23090909 is a deficient number, since it is larger than the sum of its proper divisors (1215331).

23090909 is a wasteful number, since it uses less digits than its factorization.

23090909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215330.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 23090909 is about 4805.3000946871. The cubic root of 23090909 is about 284.7608910667.

The spelling of 23090909 in words is "twenty-three million, ninety thousand, nine hundred nine".