197959869 has 10 divisors (see below), whose sum is σ = 295717950. Its totient is φ = 131973192.

The previous prime is 197959807. The next prime is 197959871. The reversal of 197959869 is 968959791.

It can be written as a sum of positive squares in only one way, i.e., 176225625 + 21734244 = 13275^2 + 4662^2 .

It is not a de Polignac number, because 197959869 - 2²⁰ = 196911293 is a prime.

It is a super-2 number, since 2×197959869² = 78376219468994322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197959469) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1221894 + ... + 1222055.

It is an arithmetic number, because the mean of its divisors is an integer number (29571795).

Almost surely, 2^197959869 is an apocalyptic number.

It is an amenable number.

197959869 is a deficient number, since it is larger than the sum of its proper divisors (97758081).

197959869 is an equidigital number, since it uses as much as digits as its factorization.

197959869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443961 (or 2443952 counting only the distinct ones).

The product of its digits is 11022480, while the sum is 63.

The square root of 197959869 is about 14069.8212142159. The cubic root of 197959869 is about 582.8082881228.

The spelling of 197959869 in words is "one hundred ninety-seven million, nine hundred fifty-nine thousand, eight hundred sixty-nine".