18741321 has 8 divisors (see below), whose sum is σ = 27764960. Its totient is φ = 12494196.

The previous prime is 18741319. The next prime is 18741367. The reversal of 18741321 is 12314781.

It is not a de Polignac number, because 18741321 - 2¹ = 18741319 is a prime.

It is a super-2 number, since 2×18741321² = 702474225650082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 694123 = 18741321 / (1 + 8 + 7 + 4 + 1 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18741311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347035 + ... + 347088.

It is an arithmetic number, because the mean of its divisors is an integer number (3470620).

Almost surely, 2^18741321 is an apocalyptic number.

It is an amenable number.

18741321 is a deficient number, since it is larger than the sum of its proper divisors (9023639).

18741321 is an equidigital number, since it uses as much as digits as its factorization.

18741321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694132 (or 694126 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 18741321 is about 4329.1247383276. The cubic root of 18741321 is about 265.6236456863.

The spelling of 18741321 in words is "eighteen million, seven hundred forty-one thousand, three hundred twenty-one".