19782043 has 2 divisors, whose sum is σ = 19782044. Its totient is φ = 19782042.

The previous prime is 19782041. The next prime is 19782079. The reversal of 19782043 is 34028791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19782043 - 2¹ = 19782041 is a prime.

Together with 19782041, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19782041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9891021 + 9891022.

It is an arithmetic number, because the mean of its divisors is an integer number (9891022).

Almost surely, 2^19782043 is an apocalyptic number.

19782043 is a deficient number, since it is larger than the sum of its proper divisors (1).

19782043 is an equidigital number, since it uses as much as digits as its factorization.

19782043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 19782043 is about 4447.7008667400. The cubic root of 19782043 is about 270.4521140276.

The spelling of 19782043 in words is "nineteen million, seven hundred eighty-two thousand, forty-three".