189793993 has 2 divisors, whose sum is σ = 189793994. Its totient is φ = 189793992.

The previous prime is 189793987. The next prime is 189794023. The reversal of 189793993 is 399397981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182439049 + 7354944 = 13507^2 + 2712^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189793993 is a prime.

It is not a weakly prime, because it can be changed into another prime (189793913) 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, 94896996 + 94896997.

It is an arithmetic number, because the mean of its divisors is an integer number (94896997).

Almost surely, 2^189793993 is an apocalyptic number.

It is an amenable number.

189793993 is a deficient number, since it is larger than the sum of its proper divisors (1).

189793993 is an equidigital number, since it uses as much as digits as its factorization.

189793993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3306744, while the sum is 58.

The square root of 189793993 is about 13776.5740661458. The cubic root of 189793993 is about 574.6818585387.

The spelling of 189793993 in words is "one hundred eighty-nine million, seven hundred ninety-three thousand, nine hundred ninety-three".