19783989 has 12 divisors (see below), whose sum is σ = 28750176. Its totient is φ = 13109352.

The previous prime is 19783957. The next prime is 19784027. The reversal of 19783989 is 98938791.

It is not a de Polignac number, because 19783989 - 2⁵ = 19783957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19783909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5079 + ... + 8084.

It is an arithmetic number, because the mean of its divisors is an integer number (2395848).

Almost surely, 2^19783989 is an apocalyptic number.

It is an amenable number.

19783989 is a deficient number, since it is larger than the sum of its proper divisors (8966187).

19783989 is a wasteful number, since it uses less digits than its factorization.

19783989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13336 (or 13333 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 19783989 is about 4447.9196260724. The cubic root of 19783989 is about 270.4609820459.

The spelling of 19783989 in words is "nineteen million, seven hundred eighty-three thousand, nine hundred eighty-nine".