199994129 has 8 divisors (see below), whose sum is σ = 206423520. Its totient is φ = 193666176.

The previous prime is 199994087. The next prime is 199994141. The reversal of 199994129 is 921499991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199994129 - 2¹⁶ = 199928593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199994159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21344 + ... + 29249.

It is an arithmetic number, because the mean of its divisors is an integer number (25802940).

Almost surely, 2^199994129 is an apocalyptic number.

It is an amenable number.

199994129 is a deficient number, since it is larger than the sum of its proper divisors (6429391).

199994129 is an equidigital number, since it uses as much as digits as its factorization.

199994129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50719.

The product of its digits is 472392, while the sum is 53.

The square root of 199994129 is about 14141.9280510120. The cubic root of 199994129 is about 584.7978252839.

The spelling of 199994129 in words is "one hundred ninety-nine million, nine hundred ninety-four thousand, one hundred twenty-nine".