18022905 has 20 divisors (see below), whose sum is σ = 32308452. Its totient is φ = 9612000.

The previous prime is 18022889. The next prime is 18022909. The reversal of 18022905 is 50922081.

It can be written as a sum of positive squares in 2 ways, for example, as 8714304 + 9308601 = 2952^2 + 3051^2 .

It is not a de Polignac number, because 18022905 - 2⁴ = 18022889 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (18022909) 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 19 ways as a sum of consecutive naturals, for example, 21846 + ... + 22655.

Almost surely, 2^18022905 is an apocalyptic number.

18022905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18022905 is a deficient number, since it is larger than the sum of its proper divisors (14285547).

18022905 is an equidigital number, since it uses as much as digits as its factorization.

18022905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44518 (or 44509 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 18022905 is about 4245.3392090621. The cubic root of 18022905 is about 262.1852554166.

Adding to 18022905 its reverse (50922081), we get a palindrome (68944986).

The spelling of 18022905 in words is "eighteen million, twenty-two thousand, nine hundred five".