18443329 has 2 divisors, whose sum is σ = 18443330. Its totient is φ = 18443328.

The previous prime is 18443303. The next prime is 18443339. The reversal of 18443329 is 92334481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9443329 + 9000000 = 3073^2 + 3000^2 .

It is a cyclic number.

It is not a de Polignac number, because 18443329 - 2⁵ = 18443297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18443294 and 18443303.

It is not a weakly prime, because it can be changed into another prime (18443339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9221664 + 9221665.

It is an arithmetic number, because the mean of its divisors is an integer number (9221665).

Almost surely, 2^18443329 is an apocalyptic number.

It is an amenable number.

18443329 is a deficient number, since it is larger than the sum of its proper divisors (1).

18443329 is an equidigital number, since it uses as much as digits as its factorization.

18443329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 18443329 is about 4294.5697106928. The cubic root of 18443329 is about 264.2082885233.

The spelling of 18443329 in words is "eighteen million, four hundred forty-three thousand, three hundred twenty-nine".