199810994 has 4 divisors (see below), whose sum is σ = 299716494. Its totient is φ = 99905496.

The previous prime is 199810943. The next prime is 199810997. The reversal of 199810994 is 499018991.

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

It can be written as a sum of positive squares in only one way, i.e., 199798225 + 12769 = 14135^2 + 113^2 .

It is not an unprimeable number, because it can be changed into a prime (199810997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49952747 + ... + 49952750.

Almost surely, 2^199810994 is an apocalyptic number.

199810994 is a deficient number, since it is larger than the sum of its proper divisors (99905500).

199810994 is an equidigital number, since it uses as much as digits as its factorization.

199810994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99905499.

The product of its (nonzero) digits is 209952, while the sum is 50.

The square root of 199810994 is about 14135.4516730100. The cubic root of 199810994 is about 584.6192706157.

The spelling of 199810994 in words is "one hundred ninety-nine million, eight hundred ten thousand, nine hundred ninety-four".