18090308 has 6 divisors (see below), whose sum is σ = 31658046. Its totient is φ = 9045152.

The previous prime is 18090301. The next prime is 18090341. The reversal of 18090308 is 80309081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9784384 + 8305924 = 3128^2 + 2882^2 .

It is not an unprimeable number, because it can be changed into a prime (18090301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2261285 + ... + 2261292.

It is an arithmetic number, because the mean of its divisors is an integer number (5276341).

Almost surely, 2^18090308 is an apocalyptic number.

It is an amenable number.

18090308 is a deficient number, since it is larger than the sum of its proper divisors (13567738).

18090308 is a wasteful number, since it uses less digits than its factorization.

18090308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4522581 (or 4522579 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 18090308 is about 4253.2702712148. The cubic root of 18090308 is about 262.5116935078.

Adding to 18090308 its reverse (80309081), we get a palindrome (98399389).

The spelling of 18090308 in words is "eighteen million, ninety thousand, three hundred eight".