199912912 has 20 divisors (see below), whose sum is σ = 387571300. Its totient is φ = 99894528.

The previous prime is 199912907. The next prime is 199912913. The reversal of 199912912 is 219219991.

It can be written as a sum of positive squares in 2 ways, for example, as 37503376 + 162409536 = 6124^2 + 12744^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199912913) 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, 33964 + ... + 39412.

It is an arithmetic number, because the mean of its divisors is an integer number (19378565).

Almost surely, 2^199912912 is an apocalyptic number.

It is an amenable number.

199912912 is a deficient number, since it is larger than the sum of its proper divisors (187658388).

199912912 is a wasteful number, since it uses less digits than its factorization.

199912912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7750 (or 7744 counting only the distinct ones).

The product of its digits is 26244, while the sum is 43.

The square root of 199912912 is about 14139.0562627072. The cubic root of 199912912 is about 584.7186530336.

The spelling of 199912912 in words is "one hundred ninety-nine million, nine hundred twelve thousand, nine hundred twelve".