18443723 has 8 divisors (see below), whose sum is σ = 19766688. Its totient is φ = 17164224.

The previous prime is 18443717. The next prime is 18443743. The reversal of 18443723 is 32734481.

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 18443723 - 2²⁴ = 1666507 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 18443723.

It is not an unprimeable number, because it can be changed into a prime (18443713) 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, 9986 + ... + 11687.

It is an arithmetic number, because the mean of its divisors is an integer number (2470836).

Almost surely, 2^18443723 is an apocalyptic number.

18443723 is a deficient number, since it is larger than the sum of its proper divisors (1322965).

18443723 is a wasteful number, since it uses less digits than its factorization.

18443723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21733.

The product of its digits is 16128, while the sum is 32.

The square root of 18443723 is about 4294.6155823310. The cubic root of 18443723 is about 264.2101699140.

The spelling of 18443723 in words is "eighteen million, four hundred forty-three thousand, seven hundred twenty-three".