194813939 has 2 divisors, whose sum is σ = 194813940. Its totient is φ = 194813938.

The previous prime is 194813867. The next prime is 194813977. The reversal of 194813939 is 939318491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 194813939 - 2¹² = 194809843 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 194813893 and 194813902.

It is not a weakly prime, because it can be changed into another prime (194813639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97406969 + 97406970.

It is an arithmetic number, because the mean of its divisors is an integer number (97406970).

Almost surely, 2^194813939 is an apocalyptic number.

194813939 is a deficient number, since it is larger than the sum of its proper divisors (1).

194813939 is an equidigital number, since it uses as much as digits as its factorization.

194813939 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 194813939 is about 13957.5764013671. The cubic root of 194813939 is about 579.7045056425.

The spelling of 194813939 in words is "one hundred ninety-four million, eight hundred thirteen thousand, nine hundred thirty-nine".