199999429 has 12 divisors (see below), whose sum is σ = 237605184. Its totient is φ = 167778744.

The previous prime is 199999427. The next prime is 199999447. The reversal of 199999429 is 924999991.

It is not a de Polignac number, because 199999429 - 2¹ = 199999427 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41119 + ... + 45724.

It is an arithmetic number, because the mean of its divisors is an integer number (19800432).

Almost surely, 2^199999429 is an apocalyptic number.

It is an amenable number.

199999429 is a deficient number, since it is larger than the sum of its proper divisors (37605755).

199999429 is an equidigital number, since it uses as much as digits as its factorization.

199999429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86904 (or 86897 counting only the distinct ones).

The product of its digits is 4251528, while the sum is 61.

The square root of 199999429 is about 14142.1154358179. The cubic root of 199999429 is about 584.8029911040.

The spelling of 199999429 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred twenty-nine".