197189550 has 72 divisors (see below), whose sum is σ = 531863280. Its totient is φ = 52377600.

The previous prime is 197189527. The next prime is 197189591. The reversal of 197189550 is 55981791.

197189550 is a `hidden beast` number, since 1 + 97 + 1 + 8 + 9 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 197189496 and 197189505.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 139246 + ... + 140654.

It is an arithmetic number, because the mean of its divisors is an integer number (7386990).

Almost surely, 2^197189550 is an apocalyptic number.

197189550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 197189550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265931640).

197189550 is an abundant number, since it is smaller than the sum of its proper divisors (334673730).

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

197189550 is a wasteful number, since it uses less digits than its factorization.

197189550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738 (or 1730 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 45.

The square root of 197189550 is about 14042.4196632917. The cubic root of 197189550 is about 582.0513470126.

The spelling of 197189550 in words is "one hundred ninety-seven million, one hundred eighty-nine thousand, five hundred fifty".