18985133 has 8 divisors (see below), whose sum is σ = 19526400. Its totient is φ = 18449680.

The previous prime is 18985093. The next prime is 18985157. The reversal of 18985133 is 33158981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18985133 - 2⁶ = 18985069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18985163) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5648 + ... + 8358.

It is an arithmetic number, because the mean of its divisors is an integer number (2440800).

Almost surely, 2^18985133 is an apocalyptic number.

It is an amenable number.

18985133 is a deficient number, since it is larger than the sum of its proper divisors (541267).

18985133 is a wasteful number, since it uses less digits than its factorization.

18985133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2907.

The product of its digits is 25920, while the sum is 38.

The square root of 18985133 is about 4357.1932479522. The cubic root of 18985133 is about 266.7705482423.

The spelling of 18985133 in words is "eighteen million, nine hundred eighty-five thousand, one hundred thirty-three".