19980743 has 2 divisors, whose sum is σ = 19980744. Its totient is φ = 19980742.

The previous prime is 19980713. The next prime is 19980791. The reversal of 19980743 is 34708991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19980743 - 2⁸ = 19980487 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19980743.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19980713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9990371 + 9990372.

It is an arithmetic number, because the mean of its divisors is an integer number (9990372).

Almost surely, 2^19980743 is an apocalyptic number.

19980743 is a deficient number, since it is larger than the sum of its proper divisors (1).

19980743 is an equidigital number, since it uses as much as digits as its factorization.

19980743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 19980743 is about 4469.9824384442. The cubic root of 19980743 is about 271.3546144502.

The spelling of 19980743 in words is "nineteen million, nine hundred eighty thousand, seven hundred forty-three".