197497989 has 24 divisors (see below), whose sum is σ = 323392160. Its totient is φ = 115139232.

The previous prime is 197497921. The next prime is 197497991. The reversal of 197497989 is 989794791.

It is not a de Polignac number, because 197497989 - 2¹¹ = 197495941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197495989) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 42199 + ... + 46644.

Almost surely, 2^197497989 is an apocalyptic number.

197497989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

197497989 is a deficient number, since it is larger than the sum of its proper divisors (125894171).

197497989 is a wasteful number, since it uses less digits than its factorization.

197497989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88881 (or 88878 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 63.

The square root of 197497989 is about 14053.3977742039. The cubic root of 197497989 is about 582.3546656767.

The spelling of 197497989 in words is "one hundred ninety-seven million, four hundred ninety-seven thousand, nine hundred eighty-nine".