23640215 has 4 divisors (see below), whose sum is σ = 28368264. Its totient is φ = 18912168.

The previous prime is 23640209. The next prime is 23640233. The reversal of 23640215 is 51204632.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23640215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2364017 + ... + 2364026.

It is an arithmetic number, because the mean of its divisors is an integer number (7092066).

Almost surely, 2^23640215 is an apocalyptic number.

23640215 is a deficient number, since it is larger than the sum of its proper divisors (4728049).

23640215 is an equidigital number, since it uses as much as digits as its factorization.

23640215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4728048.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 23640215 is about 4862.1204222026. The cubic root of 23640215 is about 287.0012626054.

Adding to 23640215 its reverse (51204632), we get a palindrome (74844847).

The spelling of 23640215 in words is "twenty-three million, six hundred forty thousand, two hundred fifteen".