199243949 has 4 divisors (see below), whose sum is σ = 206114460. Its totient is φ = 192373440.

The previous prime is 199243909. The next prime is 199243981. The reversal of 199243949 is 949342991.

199243949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 123432100 + 75811849 = 11110^2 + 8707^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199243949 is a prime.

It is a super-2 number, since 2×199243949² = 79396302426229202, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 199243897 and 199243906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199243909) 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, 3435212 + ... + 3435269.

It is an arithmetic number, because the mean of its divisors is an integer number (51528615).

Almost surely, 2^199243949 is an apocalyptic number.

It is an amenable number.

199243949 is a deficient number, since it is larger than the sum of its proper divisors (6870511).

199243949 is an equidigital number, since it uses as much as digits as its factorization.

199243949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6870510.

The product of its digits is 629856, while the sum is 50.

The square root of 199243949 is about 14115.3798744490. The cubic root of 199243949 is about 584.0657149498.

The spelling of 199243949 in words is "one hundred ninety-nine million, two hundred forty-three thousand, nine hundred forty-nine".