197806216 has 16 divisors (see below), whose sum is σ = 383676300. Its totient is φ = 95492544.

The previous prime is 197806171. The next prime is 197806223. The reversal of 197806216 is 612608791.

It can be written as a sum of positive squares in 2 ways, for example, as 185232100 + 12574116 = 13610^2 + 3546^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 426075 + ... + 426538.

Almost surely, 2^197806216 is an apocalyptic number.

It is an amenable number.

197806216 is a deficient number, since it is larger than the sum of its proper divisors (185870084).

197806216 is a wasteful number, since it uses less digits than its factorization.

197806216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852648 (or 852644 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 197806216 is about 14064.3597792434. The cubic root of 197806216 is about 582.6574605477.

The spelling of 197806216 in words is "one hundred ninety-seven million, eight hundred six thousand, two hundred sixteen".