199639197 has 6 divisors (see below), whose sum is σ = 288367742. Its totient is φ = 133092792.

The previous prime is 199639183. The next prime is 199639259. The reversal of 199639197 is 791936991.

199639197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 180794916 + 18844281 = 13446^2 + 4341^2 .

It is not a de Polignac number, because 199639197 - 2⁸ = 199638941 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 (199639117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11091058 + ... + 11091075.

Almost surely, 2^199639197 is an apocalyptic number.

It is an amenable number.

199639197 is a deficient number, since it is larger than the sum of its proper divisors (88728545).

199639197 is a wasteful number, since it uses less digits than its factorization.

199639197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22182139 (or 22182136 counting only the distinct ones).

The product of its digits is 826686, while the sum is 54.

The square root of 199639197 is about 14129.3735529924. The cubic root of 199639197 is about 584.4516711702.

The spelling of 199639197 in words is "one hundred ninety-nine million, six hundred thirty-nine thousand, one hundred ninety-seven".