199438919 has 4 divisors (see below), whose sum is σ = 199536480. Its totient is φ = 199341360.

The previous prime is 199438901. The next prime is 199438931. The reversal of 199438919 is 919834991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199438919 is a prime.

It is a super-2 number, since 2×199438919² = 79551764823777122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199437919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45647 + ... + 49824.

It is an arithmetic number, because the mean of its divisors is an integer number (49884120).

Almost surely, 2^199438919 is an apocalyptic number.

199438919 is a deficient number, since it is larger than the sum of its proper divisors (97561).

199438919 is an equidigital number, since it uses as much as digits as its factorization.

199438919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97560.

The product of its digits is 629856, while the sum is 53.

The square root of 199438919 is about 14122.2844823350. The cubic root of 199438919 is about 584.2561651810.

The spelling of 199438919 in words is "one hundred ninety-nine million, four hundred thirty-eight thousand, nine hundred nineteen".