197779220 has 12 divisors (see below), whose sum is σ = 415336404. Its totient is φ = 79111680.

The previous prime is 197779201. The next prime is 197779237. The reversal of 197779220 is 22977791.

It can be written as a sum of positive squares in 2 ways, for example, as 154902916 + 42876304 = 12446^2 + 6548^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4944461 + ... + 4944500.

It is an arithmetic number, because the mean of its divisors is an integer number (34611367).

Almost surely, 2^197779220 is an apocalyptic number.

197779220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197779220 is an abundant number, since it is smaller than the sum of its proper divisors (217557184).

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

197779220 is a wasteful number, since it uses less digits than its factorization.

197779220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9888970 (or 9888968 counting only the distinct ones).

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 197779220 is about 14063.4000156434. The cubic root of 197779220 is about 582.6309528933.

The spelling of 197779220 in words is "one hundred ninety-seven million, seven hundred seventy-nine thousand, two hundred twenty".