18133308 has 30 divisors (see below), whose sum is σ = 47404896. Its totient is φ = 6044328.

The previous prime is 18133279. The next prime is 18133309. The reversal of 18133308 is 80333181.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18133309) 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 9 ways as a sum of consecutive naturals, for example, 27660 + ... + 28307.

Almost surely, 2^18133308 is an apocalyptic number.

18133308 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18133308 is an abundant number, since it is smaller than the sum of its proper divisors (29271588).

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

18133308 is a wasteful number, since it uses less digits than its factorization.

18133308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55983 (or 55972 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18133308 is about 4258.3222048126. The cubic root of 18133308 is about 262.7195224899.

Adding to 18133308 its reverse (80333181), we get a palindrome (98466489).

It can be divided in two parts, 181 and 33308, that added together give a square (33489 = 183²).

The spelling of 18133308 in words is "eighteen million, one hundred thirty-three thousand, three hundred eight".