23850721 has 4 divisors (see below), whose sum is σ = 23860912. Its totient is φ = 23840532.

The previous prime is 23850707. The next prime is 23850769. The reversal of 23850721 is 12705832.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23850721 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23850721.

It is not an unprimeable number, because it can be changed into a prime (23850781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370 + ... + 6916.

It is an arithmetic number, because the mean of its divisors is an integer number (5965228).

Almost surely, 2^23850721 is an apocalyptic number.

It is an amenable number.

23850721 is a deficient number, since it is larger than the sum of its proper divisors (10191).

23850721 is an equidigital number, since it uses as much as digits as its factorization.

23850721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10190.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 23850721 is about 4883.7199960686. The cubic root of 23850721 is about 287.8506209971.

The spelling of 23850721 in words is "twenty-three million, eight hundred fifty thousand, seven hundred twenty-one".