23815985 has 4 divisors (see below), whose sum is σ = 28579188. Its totient is φ = 19052784.

The previous prime is 23815973. The next prime is 23815991. The reversal of 23815985 is 58951832.

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 5914624 + 17901361 = 2432^2 + 4231^2 .

It is a cyclic number.

It is not a de Polignac number, because 23815985 - 2¹² = 23811889 is a prime.

It is a super-2 number, since 2×23815985² = 1134402283040450, which contains 22 as substring.

It is a Duffinian 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, 2381594 + ... + 2381603.

It is an arithmetic number, because the mean of its divisors is an integer number (7144797).

Almost surely, 2^23815985 is an apocalyptic number.

It is an amenable number.

23815985 is a deficient number, since it is larger than the sum of its proper divisors (4763203).

23815985 is an equidigital number, since it uses as much as digits as its factorization.

23815985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4763202.

The product of its digits is 86400, while the sum is 41.

The square root of 23815985 is about 4880.1623948389. The cubic root of 23815985 is about 287.7108119861.

The spelling of 23815985 in words is "twenty-three million, eight hundred fifteen thousand, nine hundred eighty-five".