199999012 has 6 divisors (see below), whose sum is σ = 349998278. Its totient is φ = 99999504.

The previous prime is 199999001. The next prime is 199999043. The reversal of 199999012 is 210999991.

It can be written as a sum of positive squares in only one way, i.e., 138156516 + 61842496 = 11754^2 + 7864^2 .

It is a super-2 number, since 2×199999012² = 79999209601952288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999873 + ... + 24999880.

Almost surely, 2^199999012 is an apocalyptic number.

It is an amenable number.

199999012 is a deficient number, since it is larger than the sum of its proper divisors (149999266).

199999012 is a wasteful number, since it uses less digits than its factorization.

199999012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49999757 (or 49999755 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 49.

The square root of 199999012 is about 14142.1006926128. The cubic root of 199999012 is about 584.8025846645.

It can be divided in two parts, 1999990 and 12, that added together give a palindrome (2000002).

The spelling of 199999012 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, twelve".