23391605 has 4 divisors (see below), whose sum is σ = 28069932. Its totient is φ = 18713280.

The previous prime is 23391593. The next prime is 23391619. The reversal of 23391605 is 50619332.

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 5354596 + 18037009 = 2314^2 + 4247^2 .

It is not a de Polignac number, because 23391605 - 2⁸ = 23391349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2339156 + ... + 2339165.

It is an arithmetic number, because the mean of its divisors is an integer number (7017483).

Almost surely, 2^23391605 is an apocalyptic number.

It is an amenable number.

23391605 is a deficient number, since it is larger than the sum of its proper divisors (4678327).

23391605 is an equidigital number, since it uses as much as digits as its factorization.

23391605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4678326.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 23391605 is about 4836.4868448079. The cubic root of 23391605 is about 285.9916415638.

The spelling of 23391605 in words is "twenty-three million, three hundred ninety-one thousand, six hundred five".