19889849 has 4 divisors (see below), whose sum is σ = 22731264. Its totient is φ = 17048436.

The previous prime is 19889833. The next prime is 19889887. The reversal of 19889849 is 94898891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19889849 - 2⁴ = 19889833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19889794 and 19889803.

It is not an unprimeable number, because it can be changed into a prime (19889899) 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, 1420697 + ... + 1420710.

It is an arithmetic number, because the mean of its divisors is an integer number (5682816).

Almost surely, 2^19889849 is an apocalyptic number.

It is an amenable number.

19889849 is a deficient number, since it is larger than the sum of its proper divisors (2841415).

19889849 is an equidigital number, since it uses as much as digits as its factorization.

19889849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2841414.

The product of its digits is 1492992, while the sum is 56.

The square root of 19889849 is about 4459.8036952314. The cubic root of 19889849 is about 270.9425176394.

The spelling of 19889849 in words is "nineteen million, eight hundred eighty-nine thousand, eight hundred forty-nine".