23615 has 4 divisors (see below), whose sum is σ = 28344. Its totient is φ = 18888.

The previous prime is 23609. The next prime is 23623. The reversal of 23615 is 51632.

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

It is a cyclic number.

It is not a de Polignac number, because 23615 - 2⁴ = 23599 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 23593 and 23602.

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, 2357 + ... + 2366.

It is an arithmetic number, because the mean of its divisors is an integer number (7086).

2²³⁶¹⁵ is an apocalyptic number.

23615 is a deficient number, since it is larger than the sum of its proper divisors (4729).

23615 is an equidigital number, since it uses as much as digits as its factorization.

23615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4728.

The product of its digits is 180, while the sum is 17.

The square root of 23615 is about 153.6717280439. The cubic root of 23615 is about 28.6899186386.

Adding to 23615 its sum of digits (17), we get a palindrome (23632).

The spelling of 23615 in words is "twenty-three thousand, six hundred fifteen".