1989193 has 2 divisors, whose sum is σ = 1989194. Its totient is φ = 1989192.

The previous prime is 1989161. The next prime is 1989203. The reversal of 1989193 is 3919891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1937664 + 51529 = 1392^2 + 227^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989193 - 2⁵ = 1989161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1989133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994596 + 994597.

It is an arithmetic number, because the mean of its divisors is an integer number (994597).

2^1989193 is an apocalyptic number.

It is an amenable number.

1989193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989193 is an equidigital number, since it uses as much as digits as its factorization.

1989193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 40.

The square root of 1989193 is about 1410.3875353959. The cubic root of 1989193 is about 125.7647622345.

The spelling of 1989193 in words is "one million, nine hundred eighty-nine thousand, one hundred ninety-three".