19782163 has 4 divisors (see below), whose sum is σ = 19978128. Its totient is φ = 19586200.

The previous prime is 19782143. The next prime is 19782199. The reversal of 19782163 is 36128791.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19782163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19782143) 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, 97831 + ... + 98032.

It is an arithmetic number, because the mean of its divisors is an integer number (4994532).

Almost surely, 2^19782163 is an apocalyptic number.

19782163 is a deficient number, since it is larger than the sum of its proper divisors (195965).

19782163 is a wasteful number, since it uses less digits than its factorization.

19782163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195964.

The product of its digits is 18144, while the sum is 37.

The square root of 19782163 is about 4447.7143568354. The cubic root of 19782163 is about 270.4526608904.

The spelling of 19782163 in words is "nineteen million, seven hundred eighty-two thousand, one hundred sixty-three".