19982789 has 4 divisors (see below), whose sum is σ = 19992000. Its totient is φ = 19973580.

The previous prime is 19982777. The next prime is 19982797. The reversal of 19982789 is 98728991.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98728991 = 2063 ⋅47857.

It is a cyclic number.

It is not a de Polignac number, because 19982789 - 2⁴ = 19982773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19982789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19982759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644 + ... + 6354.

It is an arithmetic number, because the mean of its divisors is an integer number (4998000).

Almost surely, 2^19982789 is an apocalyptic number.

It is an amenable number.

19982789 is a deficient number, since it is larger than the sum of its proper divisors (9211).

19982789 is an equidigital number, since it uses as much as digits as its factorization.

19982789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9210.

The product of its digits is 653184, while the sum is 53.

The square root of 19982789 is about 4470.2112925454. The cubic root of 19982789 is about 271.3638762445.

The spelling of 19982789 in words is "nineteen million, nine hundred eighty-two thousand, seven hundred eighty-nine".