18112405 has 4 divisors (see below), whose sum is σ = 21734892. Its totient is φ = 14489920.

The previous prime is 18112399. The next prime is 18112441. The reversal of 18112405 is 50421181.

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 2056356 + 16056049 = 1434^2 + 4007^2 .

It is not a de Polignac number, because 18112405 - 2⁹ = 18111893 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 1811236 + ... + 1811245.

It is an arithmetic number, because the mean of its divisors is an integer number (5433723).

Almost surely, 2^18112405 is an apocalyptic number.

It is an amenable number.

18112405 is a deficient number, since it is larger than the sum of its proper divisors (3622487).

18112405 is an equidigital number, since it uses as much as digits as its factorization.

18112405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622486.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 18112405 is about 4255.8671266852. The cubic root of 18112405 is about 262.6185345239.

Adding to 18112405 its reverse (50421181), we get a palindrome (68533586).

The spelling of 18112405 in words is "eighteen million, one hundred twelve thousand, four hundred five".