18442636 has 6 divisors (see below), whose sum is σ = 32274620. Its totient is φ = 9221316.

The previous prime is 18442631. The next prime is 18442639. The reversal of 18442636 is 63624481.

It is not an unprimeable number, because it can be changed into a prime (18442631) 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 as a sum of consecutive naturals, namely, 2305326 + ... + 2305333.

Almost surely, 2^18442636 is an apocalyptic number.

It is an amenable number.

18442636 is a deficient number, since it is larger than the sum of its proper divisors (13831984).

18442636 is a wasteful number, since it uses less digits than its factorization.

18442636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4610663 (or 4610661 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 18442636 is about 4294.4890266480. The cubic root of 18442636 is about 264.2049793116.

The spelling of 18442636 in words is "eighteen million, four hundred forty-two thousand, six hundred thirty-six".