18988133 has 8 divisors (see below), whose sum is σ = 20979648. Its totient is φ = 17093824.

The previous prime is 18988121. The next prime is 18988171. The reversal of 18988133 is 33188981.

It is a happy number.

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 18988133 - 2⁴ = 18988117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18988183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23891 + ... + 24672.

It is an arithmetic number, because the mean of its divisors is an integer number (2622456).

Almost surely, 2^18988133 is an apocalyptic number.

It is an amenable number.

18988133 is a deficient number, since it is larger than the sum of its proper divisors (1991515).

18988133 is a wasteful number, since it uses less digits than its factorization.

18988133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48603.

The product of its digits is 41472, while the sum is 41.

The square root of 18988133 is about 4357.5374926672. The cubic root of 18988133 is about 266.7845990524.

The spelling of 18988133 in words is "eighteen million, nine hundred eighty-eight thousand, one hundred thirty-three".