18329189 has 4 divisors (see below), whose sum is σ = 18961260. Its totient is φ = 17697120.

The previous prime is 18329161. The next prime is 18329191. The reversal of 18329189 is 98192381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15737089 + 2592100 = 3967^2 + 1610^2 .

It is a cyclic number.

It is not a de Polignac number, because 18329189 - 2¹² = 18325093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18329119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315992 + ... + 316049.

It is an arithmetic number, because the mean of its divisors is an integer number (4740315).

Almost surely, 2^18329189 is an apocalyptic number.

It is an amenable number.

18329189 is a deficient number, since it is larger than the sum of its proper divisors (632071).

18329189 is an equidigital number, since it uses as much as digits as its factorization.

18329189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632070.

The product of its digits is 31104, while the sum is 41.

The square root of 18329189 is about 4281.2602116667. The cubic root of 18329189 is about 263.6621261136.

The spelling of 18329189 in words is "eighteen million, three hundred twenty-nine thousand, one hundred eighty-nine".