23710721 has 4 divisors (see below), whose sum is σ = 23724612. Its totient is φ = 23696832.

The previous prime is 23710681. The next prime is 23710741. The reversal of 23710721 is 12701732.

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 21520321 + 2190400 = 4639^2 + 1480^2 .

It is a cyclic number.

It is not a de Polignac number, because 23710721 - 2¹⁴ = 23694337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23710741) 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, 3956 + ... + 7941.

It is an arithmetic number, because the mean of its divisors is an integer number (5931153).

Almost surely, 2^23710721 is an apocalyptic number.

It is an amenable number.

23710721 is a deficient number, since it is larger than the sum of its proper divisors (13891).

23710721 is a wasteful number, since it uses less digits than its factorization.

23710721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13890.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 23710721 is about 4869.3655644242. The cubic root of 23710721 is about 287.2863026989.

The spelling of 23710721 in words is "twenty-three million, seven hundred ten thousand, seven hundred twenty-one".