194416639 has 2 divisors, whose sum is σ = 194416640. Its totient is φ = 194416638.

The previous prime is 194416601. The next prime is 194416669. The reversal of 194416639 is 936614491.

It is a strong prime.

It is an emirp because it is prime and its reverse (936614491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194416639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 194416595 and 194416604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194416669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97208319 + 97208320.

It is an arithmetic number, because the mean of its divisors is an integer number (97208320).

Almost surely, 2^194416639 is an apocalyptic number.

194416639 is a deficient number, since it is larger than the sum of its proper divisors (1).

194416639 is an equidigital number, since it uses as much as digits as its factorization.

194416639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 194416639 is about 13943.3367240413. The cubic root of 194416639 is about 579.3101578411.

The spelling of 194416639 in words is "one hundred ninety-four million, four hundred sixteen thousand, six hundred thirty-nine".