18004169 has 4 divisors (see below), whose sum is σ = 18069444. Its totient is φ = 17938896.

The previous prime is 18004121. The next prime is 18004171. The reversal of 18004169 is 96140081.

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 2598544 + 15405625 = 1612^2 + 3925^2 .

It is a cyclic number.

It is not a de Polignac number, because 18004169 - 2⁸ = 18003913 is a prime.

It is a super-2 number, since 2×18004169² = 648300202761122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18004369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32222 + ... + 32775.

It is an arithmetic number, because the mean of its divisors is an integer number (4517361).

Almost surely, 2^18004169 is an apocalyptic number.

It is an amenable number.

18004169 is a deficient number, since it is larger than the sum of its proper divisors (65275).

18004169 is an equidigital number, since it uses as much as digits as its factorization.

18004169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65274.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 18004169 is about 4243.1319800355. The cubic root of 18004169 is about 262.0943709532.

The spelling of 18004169 in words is "eighteen million, four thousand, one hundred sixty-nine".