18135808 has 18 divisors (see below), whose sum is σ = 36201284. Its totient is φ = 9067776.

The previous prime is 18135791. The next prime is 18135827. The reversal of 18135808 is 80853181.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35166 + ... + 35677.

Almost surely, 2^18135808 is an apocalyptic number.

It is an amenable number.

18135808 is a deficient number, since it is larger than the sum of its proper divisors (18065476).

18135808 is an frugal number, since it uses more digits than its factorization.

18135808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70859 (or 70845 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 18135808 is about 4258.6157375373. The cubic root of 18135808 is about 262.7315954594.

Adding to 18135808 its reverse (80853181), we get a palindrome (98988989).

The spelling of 18135808 in words is "eighteen million, one hundred thirty-five thousand, eight hundred eight".