197779086 has 12 divisors (see below), whose sum is σ = 428521392. Its totient is φ = 65926356.

The previous prime is 197779081. The next prime is 197779103. The reversal of 197779086 is 680977791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197779081) 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 5 ways as a sum of consecutive naturals, for example, 5493846 + ... + 5493881.

It is an arithmetic number, because the mean of its divisors is an integer number (35710116).

Almost surely, 2^197779086 is an apocalyptic number.

197779086 is an abundant number, since it is smaller than the sum of its proper divisors (230742306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

197779086 is a wasteful number, since it uses less digits than its factorization.

197779086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10987735 (or 10987732 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 54.

The square root of 197779086 is about 14063.3952515031. The cubic root of 197779086 is about 582.6308213113.

The spelling of 197779086 in words is "one hundred ninety-seven million, seven hundred seventy-nine thousand, eighty-six".