1999512194 has 16 divisors (see below), whose sum is σ = 3042722232. Its totient is φ = 985292928.

The previous prime is 1999512191. The next prime is 1999512223. The reversal of 1999512194 is 4912159991.

It can be written as a sum of positive squares in 4 ways, for example, as 1606005625 + 393506569 = 40075^2 + 19837^2 .

It is not an unprimeable number, because it can be changed into a prime (1999512191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213392 + ... + 222564.

Almost surely, 2^1999512194 is an apocalyptic number.

1999512194 is a deficient number, since it is larger than the sum of its proper divisors (1043210038).

1999512194 is a wasteful number, since it uses less digits than its factorization.

1999512194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10741.

The product of its digits is 262440, while the sum is 50.

The square root of 1999512194 is about 44715.9053805243. The cubic root of 1999512194 is about 1259.8186087246.

The spelling of 1999512194 in words is "one billion, nine hundred ninety-nine million, five hundred twelve thousand, one hundred ninety-four".