18744329 has 2 divisors, whose sum is σ = 18744330. Its totient is φ = 18744328.

The previous prime is 18744307. The next prime is 18744331. The reversal of 18744329 is 92344781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16418704 + 2325625 = 4052^2 + 1525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18744329 is a prime.

Together with 18744331, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18744292 and 18744301.

It is not a weakly prime, because it can be changed into another prime (18744529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372164 + 9372165.

It is an arithmetic number, because the mean of its divisors is an integer number (9372165).

Almost surely, 2^18744329 is an apocalyptic number.

It is an amenable number.

18744329 is a deficient number, since it is larger than the sum of its proper divisors (1).

18744329 is an equidigital number, since it uses as much as digits as its factorization.

18744329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 18744329 is about 4329.4721387255. The cubic root of 18744329 is about 265.6378558761.

The spelling of 18744329 in words is "eighteen million, seven hundred forty-four thousand, three hundred twenty-nine".