197172900 has 144 divisors (see below), whose sum is σ = 640931200. Its totient is φ = 51995520.

The previous prime is 197172887. The next prime is 197172901. The reversal of 197172900 is 9271791.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (197172901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 277746 + ... + 278454.

Almost surely, 2^197172900 is an apocalyptic number.

197172900 is a gapful number since it is divisible by the number (10) 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 197172900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320465600).

197172900 is an abundant number, since it is smaller than the sum of its proper divisors (443758300).

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

197172900 is a wasteful number, since it uses less digits than its factorization.

197172900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835 (or 822 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 36.

The square root of 197172900 is about 14041.8268042303. The cubic root of 197172900 is about 582.0349644208.

The spelling of 197172900 in words is "one hundred ninety-seven million, one hundred seventy-two thousand, nine hundred".