197921772 has 48 divisors (see below), whose sum is σ = 516324480. Its totient is φ = 65563344.

The previous prime is 197921771. The next prime is 197921821. The reversal of 197921772 is 277129791.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (197921771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11983 + ... + 23225.

It is an arithmetic number, because the mean of its divisors is an integer number (10756760).

Almost surely, 2^197921772 is an apocalyptic number.

197921772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197921772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258162240).

197921772 is an abundant number, since it is smaller than the sum of its proper divisors (318402708).

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

197921772 is a wasteful number, since it uses less digits than its factorization.

197921772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11419 (or 11411 counting only the distinct ones).

The product of its digits is 111132, while the sum is 45.

The square root of 197921772 is about 14068.4672939166. The cubic root of 197921772 is about 582.7708989422.

The spelling of 197921772 in words is "one hundred ninety-seven million, nine hundred twenty-one thousand, seven hundred seventy-two".