197665988 has 48 divisors (see below), whose sum is σ = 388249344. Its totient is φ = 87454080.

The previous prime is 197665981. The next prime is 197665997. The reversal of 197665988 is 889566791.

It is a super-2 number, since 2×197665988² = 78143685624032288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (197665981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135881 + ... + 137327.

It is an arithmetic number, because the mean of its divisors is an integer number (8088528).

Almost surely, 2^197665988 is an apocalyptic number.

It is an amenable number.

197665988 is a deficient number, since it is larger than the sum of its proper divisors (190583356).

197665988 is a wasteful number, since it uses less digits than its factorization.

197665988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572 (or 1570 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 59.

The square root of 197665988 is about 14059.3736702600. The cubic root of 197665988 is about 582.5197429253.

The spelling of 197665988 in words is "one hundred ninety-seven million, six hundred sixty-five thousand, nine hundred eighty-eight".