18135800 has 24 divisors (see below), whose sum is σ = 42166200. Its totient is φ = 7254240.

The previous prime is 18135791. The next prime is 18135827. The reversal of 18135800 is 853181.

It is a self number, because there is not a number n which added to its sum of digits gives 18135800.

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 in 5 ways as a sum of consecutive naturals, for example, 45140 + ... + 45539.

It is an arithmetic number, because the mean of its divisors is an integer number (1756925).

Almost surely, 2^18135800 is an apocalyptic number.

18135800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18135800 is an abundant number, since it is smaller than the sum of its proper divisors (24030400).

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

18135800 is a wasteful number, since it uses less digits than its factorization.

18135800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90695 (or 90686 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 18135800 is about 4258.6147982648. The cubic root of 18135800 is about 262.7315568276.

Adding to 18135800 its reverse (853181), we get a palindrome (18988981).

The spelling of 18135800 in words is "eighteen million, one hundred thirty-five thousand, eight hundred".