18121085 has 16 divisors (see below), whose sum is σ = 22982400. Its totient is φ = 13694016.

The previous prime is 18121073. The next prime is 18121093. The reversal of 18121085 is 58012181.

It is a cyclic number.

It is not a de Polignac number, because 18121085 - 2⁴ = 18121069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5486 + ... + 8144.

It is an arithmetic number, because the mean of its divisors is an integer number (1436400).

Almost surely, 2^18121085 is an apocalyptic number.

It is an amenable number.

18121085 is a deficient number, since it is larger than the sum of its proper divisors (4861315).

18121085 is a wasteful number, since it uses less digits than its factorization.

18121085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 18121085 is about 4256.8867732182. The cubic root of 18121085 is about 262.6604793464.

The spelling of 18121085 in words is "eighteen million, one hundred twenty-one thousand, eighty-five".