19989043 has 2 divisors, whose sum is σ = 19989044. Its totient is φ = 19989042.

The previous prime is 19989041. The next prime is 19989049. The reversal of 19989043 is 34098991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19989043 - 2¹ = 19989041 is a prime.

Together with 19989041, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19989041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994521 + 9994522.

It is an arithmetic number, because the mean of its divisors is an integer number (9994522).

Almost surely, 2^19989043 is an apocalyptic number.

19989043 is a deficient number, since it is larger than the sum of its proper divisors (1).

19989043 is an equidigital number, since it uses as much as digits as its factorization.

19989043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 19989043 is about 4470.9107573290. The cubic root of 19989043 is about 271.3921828148.

The spelling of 19989043 in words is "nineteen million, nine hundred eighty-nine thousand, forty-three".