199694039 has 2 divisors, whose sum is σ = 199694040. Its totient is φ = 199694038.

The previous prime is 199694003. The next prime is 199694041. The reversal of 199694039 is 930496991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199694039 is a prime.

It is a Sophie Germain prime.

Together with 199694041, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199690039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99847019 + 99847020.

It is an arithmetic number, because the mean of its divisors is an integer number (99847020).

Almost surely, 2^199694039 is an apocalyptic number.

199694039 is a deficient number, since it is larger than the sum of its proper divisors (1).

199694039 is an equidigital number, since it uses as much as digits as its factorization.

199694039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 50.

The square root of 199694039 is about 14131.3141285586. The cubic root of 199694039 is about 584.5051836475.

The spelling of 199694039 in words is "one hundred ninety-nine million, six hundred ninety-four thousand, thirty-nine".