23815 has 8 divisors (see below), whose sum is σ = 31248. Its totient is φ = 17280.

The previous prime is 23813. The next prime is 23819. The reversal of 23815 is 51832.

23815 = 67² + 68² + ... + 71².

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23815 - 2¹ = 23813 is a prime.

It is a super-3 number, since 3×23815³ = 40520333605125, which contains 333 as substring.

It is a Duffinian number.

23815 is a lucky number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 23792 and 23801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162 + ... + 271.

It is an arithmetic number, because the mean of its divisors is an integer number (3906).

2²³⁸¹⁵ is an apocalyptic number.

23815 is a deficient number, since it is larger than the sum of its proper divisors (7433).

23815 is a wasteful number, since it uses less digits than its factorization.

23815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449.

The product of its digits is 240, while the sum is 19.

The square root of 23815 is about 154.3210938271. The cubic root of 23815 is about 28.7706845476.

It can be divided in two parts, 238 and 15, that multiplied together give a triangular number (3570 = T₈₄).

The spelling of 23815 in words is "twenty-three thousand, eight hundred fifteen".