18441636 has 24 divisors (see below), whose sum is σ = 44081184. Its totient is φ = 5997120.

The previous prime is 18441629. The next prime is 18441637. The reversal of 18441636 is 63614481.

It is a junction number, because it is equal to n+sod(n) for n = 18441597 and 18441606.

It is not an unprimeable number, because it can be changed into a prime (18441637) 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 7 ways as a sum of consecutive naturals, for example, 18250 + ... + 19233.

It is an arithmetic number, because the mean of its divisors is an integer number (1836716).

Almost surely, 2^18441636 is an apocalyptic number.

It is an amenable number.

18441636 is an abundant number, since it is smaller than the sum of its proper divisors (25639548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18441636 is a wasteful number, since it uses less digits than its factorization.

18441636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37531 (or 37529 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 18441636 is about 4294.3725967829. The cubic root of 18441636 is about 264.2002039683.

The spelling of 18441636 in words is "eighteen million, four hundred forty-one thousand, six hundred thirty-six".