18743321 has 4 divisors (see below), whose sum is σ = 19558272. Its totient is φ = 17928372.

The previous prime is 18743281. The next prime is 18743323. The reversal of 18743321 is 12334781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18743321 - 2¹⁴ = 18726937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18743323) 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, 407441 + ... + 407486.

It is an arithmetic number, because the mean of its divisors is an integer number (4889568).

Almost surely, 2^18743321 is an apocalyptic number.

It is an amenable number.

18743321 is a deficient number, since it is larger than the sum of its proper divisors (814951).

18743321 is an equidigital number, since it uses as much as digits as its factorization.

18743321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814950.

The product of its digits is 4032, while the sum is 29.

The square root of 18743321 is about 4329.3557257403. The cubic root of 18743321 is about 265.6330941201.

The spelling of 18743321 in words is "eighteen million, seven hundred forty-three thousand, three hundred twenty-one".