18402205 has 8 divisors (see below), whose sum is σ = 22385592. Its totient is φ = 14519808.

The previous prime is 18402199. The next prime is 18402217. The reversal of 18402205 is 50220481.

It can be written as a sum of positive squares in 4 ways, for example, as 1279161 + 17123044 = 1131^2 + 4138^2 .

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 18402205 - 2¹⁵ = 18369437 is a prime.

It is a super-2 number, since 2×18402205² = 677282297724050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24844 + ... + 25573.

It is an arithmetic number, because the mean of its divisors is an integer number (2798199).

Almost surely, 2^18402205 is an apocalyptic number.

It is an amenable number.

18402205 is a deficient number, since it is larger than the sum of its proper divisors (3983387).

18402205 is an equidigital number, since it uses as much as digits as its factorization.

18402205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50495.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 18402205 is about 4289.7791318435. The cubic root of 18402205 is about 264.0117696390.

Adding to 18402205 its reverse (50220481), we get a palindrome (68622686).

The spelling of 18402205 in words is "eighteen million, four hundred two thousand, two hundred five".