19942673 has 2 divisors, whose sum is σ = 19942674. Its totient is φ = 19942672.

The previous prime is 19942661. The next prime is 19942709. The reversal of 19942673 is 37624991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15311569 + 4631104 = 3913^2 + 2152^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19942673 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19942673.

It is not a weakly prime, because it can be changed into another prime (19942603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9971336 + 9971337.

It is an arithmetic number, because the mean of its divisors is an integer number (9971337).

Almost surely, 2^19942673 is an apocalyptic number.

It is an amenable number.

19942673 is a deficient number, since it is larger than the sum of its proper divisors (1).

19942673 is an equidigital number, since it uses as much as digits as its factorization.

19942673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 19942673 is about 4465.7220020955. The cubic root of 19942673 is about 271.1821644379.

The spelling of 19942673 in words is "nineteen million, nine hundred forty-two thousand, six hundred seventy-three".