199420197 has 12 divisors (see below), whose sum is σ = 272228544. Its totient is φ = 129851400.

The previous prime is 199420147. The next prime is 199420213. The reversal of 199420197 is 791024991.

It is not a de Polignac number, because 199420197 - 2¹⁰ = 199419173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199420147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12429 + ... + 23522.

It is an arithmetic number, because the mean of its divisors is an integer number (22685712).

Almost surely, 2^199420197 is an apocalyptic number.

It is an amenable number.

199420197 is a deficient number, since it is larger than the sum of its proper divisors (72808347).

199420197 is an equidigital number, since it uses as much as digits as its factorization.

199420197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36040 (or 35997 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 199420197 is about 14121.6216136816. The cubic root of 199420197 is about 584.2378825805.

The spelling of 199420197 in words is "one hundred ninety-nine million, four hundred twenty thousand, one hundred ninety-seven".