23786721 has 24 divisors (see below), whose sum is σ = 39748800. Its totient is φ = 13425696.

The previous prime is 23786687. The next prime is 23786731. The reversal of 23786721 is 12768732.

It is not a de Polignac number, because 23786721 - 2⁶ = 23786657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23786731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2955 + ... + 7503.

It is an arithmetic number, because the mean of its divisors is an integer number (1656200).

Almost surely, 2^23786721 is an apocalyptic number.

23786721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23786721 is a deficient number, since it is larger than the sum of its proper divisors (15962079).

23786721 is a wasteful number, since it uses less digits than its factorization.

23786721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4645 (or 4642 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 23786721 is about 4877.1632123602. The cubic root of 23786721 is about 287.5929216968.

The spelling of 23786721 in words is "twenty-three million, seven hundred eighty-six thousand, seven hundred twenty-one".