199609443 has 24 divisors (see below), whose sum is σ = 322214256. Its totient is φ = 118022400.

The previous prime is 199609381. The next prime is 199609457. The reversal of 199609443 is 344906991.

It is not a de Polignac number, because 199609443 - 2²⁴ = 182832227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199609493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20530 + ... + 28647.

It is an arithmetic number, because the mean of its divisors is an integer number (13425594).

Almost surely, 2^199609443 is an apocalyptic number.

199609443 is a deficient number, since it is larger than the sum of its proper divisors (122604813).

199609443 is a wasteful number, since it uses less digits than its factorization.

199609443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49235 (or 49232 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 199609443 is about 14128.3206008358. The cubic root of 199609443 is about 584.4226343890.

It can be divided in two parts, 19960 and 9443, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 199609443 in words is "one hundred ninety-nine million, six hundred nine thousand, four hundred forty-three".