199674721 has 4 divisors (see below), whose sum is σ = 199725844. Its totient is φ = 199623600.

The previous prime is 199674653. The next prime is 199674731. The reversal of 199674721 is 127476991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127476991 = 31 ⋅4112161.

It can be written as a sum of positive squares in 2 ways, for example, as 146676321 + 52998400 = 12111^2 + 7280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199674721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199674731) 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, 19170 + ... + 27691.

It is an arithmetic number, because the mean of its divisors is an integer number (49931461).

It is a Poulet number, since it divides 2^199674720-1.

Almost surely, 2^199674721 is an apocalyptic number.

It is an amenable number.

199674721 is a deficient number, since it is larger than the sum of its proper divisors (51123).

199674721 is an equidigital number, since it uses as much as digits as its factorization.

199674721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51122.

The product of its digits is 190512, while the sum is 46.

The square root of 199674721 is about 14130.6305945630. The cubic root of 199674721 is about 584.4863350874.

The spelling of 199674721 in words is "one hundred ninety-nine million, six hundred seventy-four thousand, seven hundred twenty-one".