197939679 has 16 divisors (see below), whose sum is σ = 314737152. Its totient is φ = 108190368.

The previous prime is 197939671. The next prime is 197939711. The reversal of 197939679 is 976939791.

It is not a de Polignac number, because 197939679 - 2³ = 197939671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197939671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204424 + ... + 205389.

It is an arithmetic number, because the mean of its divisors is an integer number (19671072).

Almost surely, 2^197939679 is an apocalyptic number.

197939679 is a deficient number, since it is larger than the sum of its proper divisors (116797473).

197939679 is a wasteful number, since it uses less digits than its factorization.

197939679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409846.

The product of its digits is 5786802, while the sum is 60.

The square root of 197939679 is about 14069.1037027950. The cubic root of 197939679 is about 582.7884738384.

The spelling of 197939679 in words is "one hundred ninety-seven million, nine hundred thirty-nine thousand, six hundred seventy-nine".