19984133 has 4 divisors (see below), whose sum is σ = 21521388. Its totient is φ = 18446880.

The previous prime is 19984123. The next prime is 19984147. The reversal of 19984133 is 33148991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33148991 = 271 ⋅122321.

It can be written as a sum of positive squares in 2 ways, for example, as 10355524 + 9628609 = 3218^2 + 3103^2 .

It is a cyclic number.

It is not a de Polignac number, because 19984133 - 2⁴ = 19984117 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 (19984123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768608 + ... + 768633.

It is an arithmetic number, because the mean of its divisors is an integer number (5380347).

Almost surely, 2^19984133 is an apocalyptic number.

19984133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19984133 is a deficient number, since it is larger than the sum of its proper divisors (1537255).

19984133 is a wasteful number, since it uses less digits than its factorization.

19984133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537254.

The product of its digits is 23328, while the sum is 38.

The square root of 19984133 is about 4470.3616184823. The cubic root of 19984133 is about 271.3699598943.

The spelling of 19984133 in words is "nineteen million, nine hundred eighty-four thousand, one hundred thirty-three".