19884139 has 8 divisors (see below), whose sum is σ = 22221360.
Its totient is φ = 17635200.
The previous prime is 19884079. The next prime is 19884143. The reversal of 19884139 is 93148891.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 19884139 - 211 = 19882091 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 19884095 and 19884104.
It is not an unprimeable number, because it can be changed into a prime (19884439) 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, 21594 + ... + 22495.
It is an arithmetic number, because the mean of its divisors is an integer number (2777670).
Almost surely, 219884139 is an apocalyptic number.
19884139 is a deficient number, since it is larger than the sum of its proper divisors (2337221).
19884139 is a wasteful number, since it uses less digits than its factorization.
19884139 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 44141.
The product of its digits is 62208, while the sum is 43.
The square root of 19884139 is about 4459.1634865746.
The cubic root of 19884139 is about 270.9165876646.
The spelling of 19884139 in words is "nineteen million, eight hundred eighty-four thousand, one hundred thirty-nine".