194942389 has 2 divisors, whose sum is σ = 194942390. Its totient is φ = 194942388.

The previous prime is 194942311. The next prime is 194942393. The reversal of 194942389 is 983249491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194602500 + 339889 = 13950^2 + 583^2 .

It is a cyclic number.

It is not a de Polignac number, because 194942389 - 2¹³ = 194934197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194942309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97471194 + 97471195.

It is an arithmetic number, because the mean of its divisors is an integer number (97471195).

Almost surely, 2^194942389 is an apocalyptic number.

It is an amenable number.

194942389 is a deficient number, since it is larger than the sum of its proper divisors (1).

194942389 is an equidigital number, since it uses as much as digits as its factorization.

194942389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 49.

The square root of 194942389 is about 13962.1770866867. The cubic root of 194942389 is about 579.8318864730.

The spelling of 194942389 in words is "one hundred ninety-four million, nine hundred forty-two thousand, three hundred eighty-nine".