197939985 has 32 divisors (see below), whose sum is σ = 324034560. Its totient is φ = 103147200.

The previous prime is 197939947. The next prime is 197939999. The reversal of 197939985 is 589939791.

It is not a de Polignac number, because 197939985 - 2²⁵ = 164385553 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168450 + ... + 169620.

It is an arithmetic number, because the mean of its divisors is an integer number (10126080).

Almost surely, 2^197939985 is an apocalyptic number.

197939985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

197939985 is a deficient number, since it is larger than the sum of its proper divisors (126094575).

197939985 is a wasteful number, since it uses less digits than its factorization.

197939985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429.

The product of its digits is 5511240, while the sum is 60.

The square root of 197939985 is about 14069.1145776840. The cubic root of 197939985 is about 582.7887741541.

The spelling of 197939985 in words is "one hundred ninety-seven million, nine hundred thirty-nine thousand, nine hundred eighty-five".