18227723 has 4 divisors (see below), whose sum is σ = 19299960. Its totient is φ = 17155488.

The previous prime is 18227711. The next prime is 18227761. The reversal of 18227723 is 32772281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18227723 - 2¹⁰ = 18226699 is a prime.

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 18227723.

It is not an unprimeable number, because it can be changed into a prime (18227123) 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, 536093 + ... + 536126.

It is an arithmetic number, because the mean of its divisors is an integer number (4824990).

Almost surely, 2^18227723 is an apocalyptic number.

18227723 is a deficient number, since it is larger than the sum of its proper divisors (1072237).

18227723 is a wasteful number, since it uses less digits than its factorization.

18227723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072236.

The product of its digits is 9408, while the sum is 32.

The square root of 18227723 is about 4269.3937508738. The cubic root of 18227723 is about 263.1747021244.

The spelling of 18227723 in words is "eighteen million, two hundred twenty-seven thousand, seven hundred twenty-three".