18440323 has 4 divisors (see below), whose sum is σ = 20116728. Its totient is φ = 16763920.

The previous prime is 18440299. The next prime is 18440327. The reversal of 18440323 is 32304481.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18440323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18440327) 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, 838186 + ... + 838207.

It is an arithmetic number, because the mean of its divisors is an integer number (5029182).

Almost surely, 2^18440323 is an apocalyptic number.

18440323 is a deficient number, since it is larger than the sum of its proper divisors (1676405).

18440323 is a wasteful number, since it uses less digits than its factorization.

18440323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676404.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 18440323 is about 4294.2197195765. The cubic root of 18440323 is about 264.1939336804.

The spelling of 18440323 in words is "eighteen million, four hundred forty thousand, three hundred twenty-three".