199907969 has 4 divisors (see below), whose sum is σ = 199936260. Its totient is φ = 199879680.

The previous prime is 199907963. The next prime is 199907977. The reversal of 199907969 is 969709991.

199907969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 131217025 + 68690944 = 11455^2 + 8288^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199907969 is a prime.

It is a super-2 number, since 2×199907969² = 79926392139409922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199907963) 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, 6449 + ... + 21009.

It is an arithmetic number, because the mean of its divisors is an integer number (49984065).

Almost surely, 2^199907969 is an apocalyptic number.

It is an amenable number.

199907969 is a deficient number, since it is larger than the sum of its proper divisors (28291).

199907969 is a wasteful number, since it uses less digits than its factorization.

199907969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28290.

The product of its (nonzero) digits is 2480058, while the sum is 59.

The square root of 199907969 is about 14138.8814621242. The cubic root of 199907969 is about 584.7138337883.

The spelling of 199907969 in words is "one hundred ninety-nine million, nine hundred seven thousand, nine hundred sixty-nine".