19889107 has 4 divisors (see below), whose sum is σ = 22730416. Its totient is φ = 17047800.

The previous prime is 19889087. The next prime is 19889117. The reversal of 19889107 is 70198891.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-19889107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19889117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1420644 + ... + 1420657.

It is an arithmetic number, because the mean of its divisors is an integer number (5682604).

Almost surely, 2^19889107 is an apocalyptic number.

19889107 is a deficient number, since it is larger than the sum of its proper divisors (2841309).

19889107 is an equidigital number, since it uses as much as digits as its factorization.

19889107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2841308.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 19889107 is about 4459.7205069376. The cubic root of 19889107 is about 270.9391483856.

The spelling of 19889107 in words is "nineteen million, eight hundred eighty-nine thousand, one hundred seven".