18135898 has 16 divisors (see below), whose sum is σ = 29756160. Its totient is φ = 8221600.

The previous prime is 18135881. The next prime is 18135907. The reversal of 18135898 is 89853181.

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 7 ways as a sum of consecutive naturals, for example, 9678 + ... + 11398.

It is an arithmetic number, because the mean of its divisors is an integer number (1859760).

Almost surely, 2^18135898 is an apocalyptic number.

18135898 is a deficient number, since it is larger than the sum of its proper divisors (11620262).

18135898 is a wasteful number, since it uses less digits than its factorization.

18135898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213.

The product of its digits is 69120, while the sum is 43.

The square root of 18135898 is about 4258.6263043381. The cubic root of 18135898 is about 262.7320300656.

The spelling of 18135898 in words is "eighteen million, one hundred thirty-five thousand, eight hundred ninety-eight".