199432891 has 32 divisors (see below), whose sum is σ = 241920000. Its totient is φ = 164235456.

The previous prime is 199432867. The next prime is 199432927. The reversal of 199432891 is 198234991.

199432891 = 159² + 160² + ... + 844².

It is a happy number.

It is not a de Polignac number, because 199432891 - 2¹³ = 199424699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199436891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1434700 + ... + 1434838.

It is an arithmetic number, because the mean of its divisors is an integer number (7560000).

Almost surely, 2^199432891 is an apocalyptic number.

199432891 is a deficient number, since it is larger than the sum of its proper divisors (42487109).

199432891 is an equidigital number, since it uses as much as digits as its factorization.

199432891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 282 counting only the distinct ones).

The product of its digits is 139968, while the sum is 46.

The square root of 199432891 is about 14122.0710591613. The cubic root of 199432891 is about 584.2502787812.

The spelling of 199432891 in words is "one hundred ninety-nine million, four hundred thirty-two thousand, eight hundred ninety-one".