223423721 has 8 divisors (see below), whose sum is σ = 224816040. Its totient is φ = 222035968.

The previous prime is 223423709. The next prime is 223423729. The reversal of 223423721 is 127324322.

It is a happy number.

223423721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1413721 + 222010000 = 1189^2 + 14900^2 .

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 223423721 - 2¹⁸ = 223161577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223423729) 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, 157865 + ... + 159273.

It is an arithmetic number, because the mean of its divisors is an integer number (28102005).

Almost surely, 2^223423721 is an apocalyptic number.

It is an amenable number.

223423721 is a deficient number, since it is larger than the sum of its proper divisors (1392319).

223423721 is a wasteful number, since it uses less digits than its factorization.

223423721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283.

The product of its digits is 4032, while the sum is 26.

The square root of 223423721 is about 14947.3650186245. The cubic root of 223423721 is about 606.7965368559.

The spelling of 223423721 in words is "two hundred twenty-three million, four hundred twenty-three thousand, seven hundred twenty-one".