18143636 has 12 divisors (see below), whose sum is σ = 36287328. Its totient is φ = 7775832.

The previous prime is 18143633. The next prime is 18143659. The reversal of 18143636 is 63634181.

18143636 is an admirable number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18143633) 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 3 ways as a sum of consecutive naturals, for example, 323966 + ... + 324021.

It is an arithmetic number, because the mean of its divisors is an integer number (3023944).

Almost surely, 2^18143636 is an apocalyptic number.

It is an amenable number.

18143636 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18143636 is a wasteful number, since it uses less digits than its factorization.

18143636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647998 (or 647996 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 18143636 is about 4259.5347163745. The cubic root of 18143636 is about 262.7693911671.

The spelling of 18143636 in words is "eighteen million, one hundred forty-three thousand, six hundred thirty-six".