18541636 has 9 divisors (see below), whose sum is σ = 32462941. Its totient is φ = 9266512.

The previous prime is 18541631. The next prime is 18541639. The reversal of 18541636 is 63614581.

It is a happy number.

The square root of 18541636 is 4306.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1368900 + 17172736 = 1170^2 + 4144^2 .

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18541631) 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 2 ways as a sum of consecutive naturals, for example, 7536 + ... + 9688.

Almost surely, 2^18541636 is an apocalyptic number.

18541636 is the 4306-th square number.

It is an amenable number.

18541636 is a deficient number, since it is larger than the sum of its proper divisors (13921305).

18541636 is an frugal number, since it uses more digits than its factorization.

18541636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310 (or 2155 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The cubic root of 18541636 is about 264.6768863596.

The spelling of 18541636 in words is "eighteen million, five hundred forty-one thousand, six hundred thirty-six".