23391909 has 12 divisors (see below), whose sum is σ = 35040096. Its totient is φ = 15594444.

The previous prime is 23391889. The next prime is 23391913. The reversal of 23391909 is 90919332.

It is not a de Polignac number, because 23391909 - 2⁸ = 23391653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23391919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47889 + ... + 48374.

It is an arithmetic number, because the mean of its divisors is an integer number (2920008).

Almost surely, 2^23391909 is an apocalyptic number.

It is an amenable number.

23391909 is a deficient number, since it is larger than the sum of its proper divisors (11648187).

23391909 is an frugal number, since it uses more digits than its factorization.

23391909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96278 (or 96266 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 23391909 is about 4836.5182724766. The cubic root of 23391909 is about 285.9928804852.

The spelling of 23391909 in words is "twenty-three million, three hundred ninety-one thousand, nine hundred nine".