199965844 has 12 divisors (see below), whose sum is σ = 376858804. Its totient is φ = 92291904.

The previous prime is 199965811. The next prime is 199965851. The reversal of 199965844 is 448569991.

It can be written as a sum of positive squares in 2 ways, for example, as 31225744 + 168740100 = 5588^2 + 12990^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1922697 + ... + 1922800.

Almost surely, 2^199965844 is an apocalyptic number.

It is an amenable number.

199965844 is a deficient number, since it is larger than the sum of its proper divisors (176892960).

199965844 is a wasteful number, since it uses less digits than its factorization.

199965844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3845514 (or 3845512 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 55.

The square root of 199965844 is about 14140.9279752073. The cubic root of 199965844 is about 584.7702548306.

The spelling of 199965844 in words is "one hundred ninety-nine million, nine hundred sixty-five thousand, eight hundred forty-four".