19984789 has 8 divisors (see below), whose sum is σ = 22949280. Its totient is φ = 17211600.

The previous prime is 19984747. The next prime is 19984807. The reversal of 19984789 is 98748991.

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 19984789 - 2¹³ = 19976597 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 (19984189) 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, 47602 + ... + 48019.

It is an arithmetic number, because the mean of its divisors is an integer number (2868660).

Almost surely, 2^19984789 is an apocalyptic number.

19984789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19984789 is a deficient number, since it is larger than the sum of its proper divisors (2964491).

19984789 is a wasteful number, since it uses less digits than its factorization.

19984789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95651.

The product of its digits is 1306368, while the sum is 55.

The square root of 19984789 is about 4470.4349900205. The cubic root of 19984789 is about 271.3729291958.

The spelling of 19984789 in words is "nineteen million, nine hundred eighty-four thousand, seven hundred eighty-nine".