18985306 has 16 divisors (see below), whose sum is σ = 28911168. Its totient is φ = 9349600.

The previous prime is 18985301. The next prime is 18985319. The reversal of 18985306 is 60358981.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18985301) 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, 60891 + ... + 61201.

It is an arithmetic number, because the mean of its divisors is an integer number (1806948).

Almost surely, 2^18985306 is an apocalyptic number.

18985306 is a deficient number, since it is larger than the sum of its proper divisors (9925862).

18985306 is a wasteful number, since it uses less digits than its factorization.

18985306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 18985306 is about 4357.2131001364. The cubic root of 18985306 is about 266.7713585459.

It can be divided in two parts, 18985 and 306, that added together give a palindrome (19291).

The spelling of 18985306 in words is "eighteen million, nine hundred eighty-five thousand, three hundred six".