1943993 has 2 divisors, whose sum is σ = 1943994. Its totient is φ = 1943992.

The previous prime is 1943959. The next prime is 1944011. The reversal of 1943993 is 3993491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1075369 + 868624 = 1037^2 + 932^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1943993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1943923) 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, 971996 + 971997.

It is an arithmetic number, because the mean of its divisors is an integer number (971997).

2^1943993 is an apocalyptic number.

It is an amenable number.

1943993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1943993 is an equidigital number, since it uses as much as digits as its factorization.

1943993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 38.

The square root of 1943993 is about 1394.2714943654. The cubic root of 1943993 is about 124.8048795827.

The spelling of 1943993 in words is "one million, nine hundred forty-three thousand, nine hundred ninety-three".