18128329 has 2 divisors, whose sum is σ = 18128330. Its totient is φ = 18128328.

The previous prime is 18128317. The next prime is 18128333. The reversal of 18128329 is 92382181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10017225 + 8111104 = 3165^2 + 2848^2 .

It is a cyclic number.

It is not a de Polignac number, because 18128329 - 2²³ = 9739721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18128294 and 18128303.

It is not a weakly prime, because it can be changed into another prime (18128129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9064164 + 9064165.

It is an arithmetic number, because the mean of its divisors is an integer number (9064165).

Almost surely, 2^18128329 is an apocalyptic number.

It is an amenable number.

18128329 is a deficient number, since it is larger than the sum of its proper divisors (1).

18128329 is an equidigital number, since it uses as much as digits as its factorization.

18128329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 18128329 is about 4257.7375447531. The cubic root of 18128329 is about 262.6954746577.

The spelling of 18128329 in words is "eighteen million, one hundred twenty-eight thousand, three hundred twenty-nine".