18368905 has 4 divisors (see below), whose sum is σ = 22042692. Its totient is φ = 14695120.

The previous prime is 18368887. The next prime is 18368923. The reversal of 18368905 is 50986381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50986381 = 4153 ⋅12277.

It is an interprime number because it is at equal distance from previous prime (18368887) and next prime (18368923).

It can be written as a sum of positive squares in 2 ways, for example, as 7767369 + 10601536 = 2787^2 + 3256^2 .

It is not a de Polignac number, because 18368905 - 2⁵ = 18368873 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1836886 + ... + 1836895.

It is an arithmetic number, because the mean of its divisors is an integer number (5510673).

Almost surely, 2^18368905 is an apocalyptic number.

It is an amenable number.

18368905 is a deficient number, since it is larger than the sum of its proper divisors (3673787).

18368905 is an equidigital number, since it uses as much as digits as its factorization.

18368905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3673786.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 18368905 is about 4285.8960556691. The cubic root of 18368905 is about 263.8524245994.

The spelling of 18368905 in words is "eighteen million, three hundred sixty-eight thousand, nine hundred five".