199899397 has 4 divisors (see below), whose sum is σ = 201473536. Its totient is φ = 198325260.

The previous prime is 199899383. The next prime is 199899421. The reversal of 199899397 is 793998991.

199899397 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199899397 - 2⁷ = 199899269 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, 786879 + ... + 787132.

It is an arithmetic number, because the mean of its divisors is an integer number (50368384).

Almost surely, 2^199899397 is an apocalyptic number.

It is an amenable number.

199899397 is a deficient number, since it is larger than the sum of its proper divisors (1574139).

199899397 is a wasteful number, since it uses less digits than its factorization.

199899397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574138.

The product of its digits is 9920232, while the sum is 64.

The square root of 199899397 is about 14138.5783231554. The cubic root of 199899397 is about 584.7054762114.

The spelling of 199899397 in words is "one hundred ninety-nine million, eight hundred ninety-nine thousand, three hundred ninety-seven".