18691085 has 16 divisors (see below), whose sum is σ = 25775616. Its totient is φ = 12745728.

The previous prime is 18691063. The next prime is 18691091. The reversal of 18691085 is 58019681.

It is a cyclic number.

It is not a de Polignac number, because 18691085 - 2⁶ = 18691021 is a prime.

It is a Duffinian number.

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, 5372 + ... + 8138.

It is an arithmetic number, because the mean of its divisors is an integer number (1610976).

Almost surely, 2^18691085 is an apocalyptic number.

It is an amenable number.

18691085 is a deficient number, since it is larger than the sum of its proper divisors (7084531).

18691085 is a wasteful number, since it uses less digits than its factorization.

18691085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2972.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 18691085 is about 4323.3187483691. The cubic root of 18691085 is about 265.3860991090.

The spelling of 18691085 in words is "eighteen million, six hundred ninety-one thousand, eighty-five".