199442447 has 4 divisors (see below), whose sum is σ = 199825776. Its totient is φ = 199059120.

The previous prime is 199442431. The next prime is 199442459. The reversal of 199442447 is 744244991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199442447 - 2⁴ = 199442431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199442398 and 199442407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199442417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190883 + ... + 191924.

It is an arithmetic number, because the mean of its divisors is an integer number (49956444).

Almost surely, 2^199442447 is an apocalyptic number.

199442447 is a deficient number, since it is larger than the sum of its proper divisors (383329).

199442447 is an equidigital number, since it uses as much as digits as its factorization.

199442447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383328.

The product of its digits is 290304, while the sum is 44.

The square root of 199442447 is about 14122.4093907520. The cubic root of 199442447 is about 584.2596102518.

The spelling of 199442447 in words is "one hundred ninety-nine million, four hundred forty-two thousand, four hundred forty-seven".