23721985 has 32 divisors (see below), whose sum is σ = 33997824. Its totient is φ = 15552000.

The previous prime is 23721979. The next prime is 23721991. The reversal of 23721985 is 58912732.

It is an interprime number because it is at equal distance from previous prime (23721979) and next prime (23721991).

It is not a de Polignac number, because 23721985 - 2⁷ = 23721857 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87400 + ... + 87670.

It is an arithmetic number, because the mean of its divisors is an integer number (1062432).

Almost surely, 2^23721985 is an apocalyptic number.

It is an amenable number.

23721985 is a deficient number, since it is larger than the sum of its proper divisors (10275839).

23721985 is a wasteful number, since it uses less digits than its factorization.

23721985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385.

The product of its digits is 30240, while the sum is 37.

The square root of 23721985 is about 4870.5220459413. The cubic root of 23721985 is about 287.3317881795.

It can be divided in two parts, 237 and 21985, that added together give a palindrome (22222).

The spelling of 23721985 in words is "twenty-three million, seven hundred twenty-one thousand, nine hundred eighty-five".