18047205 has 40 divisors (see below), whose sum is σ = 35301024. Its totient is φ = 8748000.

The previous prime is 18047191. The next prime is 18047209. The reversal of 18047205 is 50274081.

It is not a de Polignac number, because 18047205 - 2⁵ = 18047173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18047209) 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 39 ways as a sum of consecutive naturals, for example, 2430 + ... + 6480.

Almost surely, 2^18047205 is an apocalyptic number.

18047205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18047205 is a deficient number, since it is larger than the sum of its proper divisors (17253819).

18047205 is a wasteful number, since it uses less digits than its factorization.

18047205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4079 (or 4070 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 18047205 is about 4248.2002071466. The cubic root of 18047205 is about 262.3030359205.

It can be divided in two parts, 1804 and 7205, that added together give a palindrome (9009).

The spelling of 18047205 in words is "eighteen million, forty-seven thousand, two hundred five".