194442439 has 2 divisors, whose sum is σ = 194442440. Its totient is φ = 194442438.

The previous prime is 194442427. The next prime is 194442497. The reversal of 194442439 is 934244491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194442439 - 2⁹ = 194441927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194422439) 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, 97221219 + 97221220.

It is an arithmetic number, because the mean of its divisors is an integer number (97221220).

Almost surely, 2^194442439 is an apocalyptic number.

194442439 is a deficient number, since it is larger than the sum of its proper divisors (1).

194442439 is an equidigital number, since it uses as much as digits as its factorization.

194442439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 40.

The square root of 194442439 is about 13944.2618664453. The cubic root of 194442439 is about 579.3357824328.

The spelling of 194442439 in words is "one hundred ninety-four million, four hundred forty-two thousand, four hundred thirty-nine".