19884161 has 8 divisors (see below), whose sum is σ = 21726624. Its totient is φ = 18047520.

The previous prime is 19884157. The next prime is 19884181. The reversal of 19884161 is 16148891.

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 19884161 - 2² = 19884157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19884181) 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, 8981 + ... + 10973.

It is an arithmetic number, because the mean of its divisors is an integer number (2715828).

Almost surely, 2^19884161 is an apocalyptic number.

19884161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19884161 is a deficient number, since it is larger than the sum of its proper divisors (1842463).

19884161 is a wasteful number, since it uses less digits than its factorization.

19884161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911.

The product of its digits is 13824, while the sum is 38.

The square root of 19884161 is about 4459.1659534043. The cubic root of 19884161 is about 270.9166875795.

The spelling of 19884161 in words is "nineteen million, eight hundred eighty-four thousand, one hundred sixty-one".