394696109 has 2 divisors, whose sum is σ = 394696110. Its totient is φ = 394696108.

The previous prime is 394696091. The next prime is 394696121. The reversal of 394696109 is 901696493.

Together with previous prime (394696091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391644100 + 3052009 = 19790^2 + 1747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394696109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394696189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197348054 + 197348055.

It is an arithmetic number, because the mean of its divisors is an integer number (197348055).

Almost surely, 2^394696109 is an apocalyptic number.

It is an amenable number.

394696109 is a deficient number, since it is larger than the sum of its proper divisors (1).

394696109 is an equidigital number, since it uses as much as digits as its factorization.

394696109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 394696109 is about 19866.9602355267. The cubic root of 394696109 is about 733.5351818791.

The spelling of 394696109 in words is "three hundred ninety-four million, six hundred ninety-six thousand, one hundred nine".