18308308 has 6 divisors (see below), whose sum is σ = 32039546. Its totient is φ = 9154152.

The previous prime is 18308293. The next prime is 18308359. The reversal of 18308308 is 80380381.

It can be written as a sum of positive squares in only one way, i.e., 9909904 + 8398404 = 3148^2 + 2898^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18308308.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2288535 + ... + 2288542.

Almost surely, 2^18308308 is an apocalyptic number.

It is an amenable number.

18308308 is a deficient number, since it is larger than the sum of its proper divisors (13731238).

18308308 is a wasteful number, since it uses less digits than its factorization.

18308308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4577081 (or 4577079 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18308308 is about 4278.8208656124. The cubic root of 18308308 is about 263.5619649107.

Adding to 18308308 its reverse (80380381), we get a palindrome (98688689).

The spelling of 18308308 in words is "eighteen million, three hundred eight thousand, three hundred eight".