18081606 has 8 divisors (see below), whose sum is σ = 36163224. Its totient is φ = 6027200.

The previous prime is 18081601. The next prime is 18081607. The reversal of 18081606 is 60618081.

It is a sphenic number, since it is the product of 3 distinct primes.

18081606 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1506795 + ... + 1506806.

It is an arithmetic number, because the mean of its divisors is an integer number (4520403).

Almost surely, 2^18081606 is an apocalyptic number.

18081606 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.

18081606 is a wasteful number, since it uses less digits than its factorization.

18081606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3013606.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 18081606 is about 4252.2471706146. The cubic root of 18081606 is about 262.4695946642.

Adding to 18081606 its reverse (60618081), we get a palindrome (78699687).

The spelling of 18081606 in words is "eighteen million, eighty-one thousand, six hundred six".