194831939 has 2 divisors, whose sum is σ = 194831940. Its totient is φ = 194831938.

The previous prime is 194831921. The next prime is 194831971. The reversal of 194831939 is 939138491.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194831939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 194831893 and 194831902.

It is not a weakly prime, because it can be changed into another prime (194831999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97415969 + 97415970.

It is an arithmetic number, because the mean of its divisors is an integer number (97415970).

Almost surely, 2^194831939 is an apocalyptic number.

194831939 is a deficient number, since it is larger than the sum of its proper divisors (1).

194831939 is an equidigital number, since it uses as much as digits as its factorization.

194831939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 47.

The square root of 194831939 is about 13958.2211975595. The cubic root of 194831939 is about 579.7223591900.

The spelling of 194831939 in words is "one hundred ninety-four million, eight hundred thirty-one thousand, nine hundred thirty-nine".