199986429 has 4 divisors (see below), whose sum is σ = 266648576. Its totient is φ = 133324284.

The previous prime is 199986337. The next prime is 199986431. The reversal of 199986429 is 924689991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 924689991 = 3 ⋅308229997.

It is not a de Polignac number, because 199986429 - 2⁹ = 199985917 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 (199986439) 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 in 3 ways as a sum of consecutive naturals, for example, 33331069 + ... + 33331074.

It is an arithmetic number, because the mean of its divisors is an integer number (66662144).

Almost surely, 2^199986429 is an apocalyptic number.

It is an amenable number.

199986429 is a deficient number, since it is larger than the sum of its proper divisors (66662147).

199986429 is an equidigital number, since it uses as much as digits as its factorization.

199986429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66662146.

The product of its digits is 2519424, while the sum is 57.

The square root of 199986429 is about 14141.6558082850. The cubic root of 199986429 is about 584.7903200618.

The spelling of 199986429 in words is "one hundred ninety-nine million, nine hundred eighty-six thousand, four hundred twenty-nine".