194989 has 2 divisors, whose sum is σ = 194990. Its totient is φ = 194988.

The previous prime is 194981. The next prime is 195023. The reversal of 194989 is 989491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110889 + 84100 = 333^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 194989 - 2³ = 194981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97494 + 97495.

It is an arithmetic number, because the mean of its divisors is an integer number (97495).

2¹⁹⁴⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

194989 is a deficient number, since it is larger than the sum of its proper divisors (1).

194989 is an equidigital number, since it uses as much as digits as its factorization.

194989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 40.

The square root of 194989 is about 441.5755880934. The cubic root of 194989 is about 57.9878095664.

The spelling of 194989 in words is "one hundred ninety-four thousand, nine hundred eighty-nine".