18744331 has 2 divisors, whose sum is σ = 18744332. Its totient is φ = 18744330.

The previous prime is 18744329. The next prime is 18744347. The reversal of 18744331 is 13344781.

It is a weak prime.

It is an emirp because it is prime and its reverse (13344781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18744331 - 2¹ = 18744329 is a prime.

It is a super-2 number, since 2×18744331² = 702699889275122, which contains 22 as substring.

Together with 18744329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18744293 and 18744302.

It is not a weakly prime, because it can be changed into another prime (18744361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372165 + 9372166.

It is an arithmetic number, because the mean of its divisors is an integer number (9372166).

Almost surely, 2^18744331 is an apocalyptic number.

18744331 is a deficient number, since it is larger than the sum of its proper divisors (1).

18744331 is an equidigital number, since it uses as much as digits as its factorization.

18744331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 18744331 is about 4329.4723697005. The cubic root of 18744331 is about 265.6378653238.

The spelling of 18744331 in words is "eighteen million, seven hundred forty-four thousand, three hundred thirty-one".