18090305 has 8 divisors (see below), whose sum is σ = 22652352. Its totient is φ = 13842928.

The previous prime is 18090301. The next prime is 18090341. The reversal of 18090305 is 50309081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18090305 - 2² = 18090301 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18090301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78539 + ... + 78768.

It is an arithmetic number, because the mean of its divisors is an integer number (2831544).

Almost surely, 2^18090305 is an apocalyptic number.

It is an amenable number.

18090305 is a deficient number, since it is larger than the sum of its proper divisors (4562047).

18090305 is a wasteful number, since it uses less digits than its factorization.

18090305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157335.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 18090305 is about 4253.2699185450. The cubic root of 18090305 is about 262.5116789966.

Adding to 18090305 its reverse (50309081), we get a palindrome (68399386).

The spelling of 18090305 in words is "eighteen million, ninety thousand, three hundred five".