199899407 has 4 divisors (see below), whose sum is σ = 206792520. Its totient is φ = 193006296.

The previous prime is 199899383. The next prime is 199899421. The reversal of 199899407 is 704998991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 704998991 = 67 ⋅10522373.

It is a cyclic number.

It is not a de Polignac number, because 199899407 - 2¹⁴ = 199883023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199899307) 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, 3446513 + ... + 3446570.

It is an arithmetic number, because the mean of its divisors is an integer number (51698130).

Almost surely, 2^199899407 is an apocalyptic number.

199899407 is a deficient number, since it is larger than the sum of its proper divisors (6893113).

199899407 is an equidigital number, since it uses as much as digits as its factorization.

199899407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6893112.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 199899407 is about 14138.5786767977. The cubic root of 199899407 is about 584.7054859614.

The spelling of 199899407 in words is "one hundred ninety-nine million, eight hundred ninety-nine thousand, four hundred seven".