18305636 has 6 divisors (see below), whose sum is σ = 32034870. Its totient is φ = 9152816.

The previous prime is 18305633. The next prime is 18305657. The reversal of 18305636 is 63650381.

It can be written as a sum of positive squares in only one way, i.e., 16728100 + 1577536 = 4090^2 + 1256^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18305633) 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, 2288201 + ... + 2288208.

It is an arithmetic number, because the mean of its divisors is an integer number (5339145).

Almost surely, 2^18305636 is an apocalyptic number.

It is an amenable number.

18305636 is a deficient number, since it is larger than the sum of its proper divisors (13729234).

18305636 is a wasteful number, since it uses less digits than its factorization.

18305636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4576413 (or 4576411 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 18305636 is about 4278.5086186661. The cubic root of 18305636 is about 263.5491424654.

The spelling of 18305636 in words is "eighteen million, three hundred five thousand, six hundred thirty-six".