4019993 has 2 divisors, whose sum is σ = 4019994. Its totient is φ = 4019992.

The previous prime is 4019909. The next prime is 4020011. The reversal of 4019993 is 3999104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3948169 + 71824 = 1987^2 + 268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4019993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4019693) 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 as a sum of consecutive naturals, namely, 2009996 + 2009997.

It is an arithmetic number, because the mean of its divisors is an integer number (2009997).

Almost surely, 2^4019993 is an apocalyptic number.

It is an amenable number.

4019993 is a deficient number, since it is larger than the sum of its proper divisors (1).

4019993 is an equidigital number, since it uses as much as digits as its factorization.

4019993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 4019993 is about 2004.9920199342. The cubic root of 4019993 is about 159.0041400238.

The spelling of 4019993 in words is "four million, nineteen thousand, nine hundred ninety-three".