194394143 has 2 divisors, whose sum is σ = 194394144. Its totient is φ = 194394142.

The previous prime is 194394131. The next prime is 194394169. The reversal of 194394143 is 341493491.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (341493491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194394143 - 2⁴ = 194394127 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 194394097 and 194394106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194394113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97197071 + 97197072.

It is an arithmetic number, because the mean of its divisors is an integer number (97197072).

Almost surely, 2^194394143 is an apocalyptic number.

194394143 is a deficient number, since it is larger than the sum of its proper divisors (1).

194394143 is an equidigital number, since it uses as much as digits as its factorization.

194394143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 38.

The square root of 194394143 is about 13942.5300071400. The cubic root of 194394143 is about 579.2878129361.

The spelling of 194394143 in words is "one hundred ninety-four million, three hundred ninety-four thousand, one hundred forty-three".