23730721 has 8 divisors (see below), whose sum is σ = 27209984. Its totient is φ = 20273760.

The previous prime is 23730719. The next prime is 23730737. The reversal of 23730721 is 12703732.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23730721 - 2¹ = 23730719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23730121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3225 + ... + 7606.

It is an arithmetic number, because the mean of its divisors is an integer number (3401248).

Almost surely, 2^23730721 is an apocalyptic number.

It is an amenable number.

23730721 is a deficient number, since it is larger than the sum of its proper divisors (3479263).

23730721 is a wasteful number, since it uses less digits than its factorization.

23730721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11151.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 23730721 is about 4871.4187871707. The cubic root of 23730721 is about 287.3670553579.

The spelling of 23730721 in words is "twenty-three million, seven hundred thirty thousand, seven hundred twenty-one".