19982065 has 4 divisors (see below), whose sum is σ = 23978484. Its totient is φ = 15985648.

The previous prime is 19982063. The next prime is 19982069. The reversal of 19982065 is 56028991.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13133376 + 6848689 = 3624^2 + 2617^2 .

It is a cyclic number.

It is not a de Polignac number, because 19982065 - 2¹ = 19982063 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19982063) 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 3 ways as a sum of consecutive naturals, for example, 1998202 + ... + 1998211.

It is an arithmetic number, because the mean of its divisors is an integer number (5994621).

Almost surely, 2^19982065 is an apocalyptic number.

It is an amenable number.

19982065 is a deficient number, since it is larger than the sum of its proper divisors (3996419).

19982065 is an equidigital number, since it uses as much as digits as its factorization.

19982065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996418.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 19982065 is about 4470.1303112997. The cubic root of 19982065 is about 271.3605989272.

The spelling of 19982065 in words is "nineteen million, nine hundred eighty-two thousand, sixty-five".