197440 has 28 divisors (see below), whose sum is σ = 470916. Its totient is φ = 78848.

The previous prime is 197423. The next prime is 197441. The reversal of 197440 is 44791.

It can be written as a sum of positive squares in 2 ways, for example, as 30976 + 166464 = 176^2 + 408^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12 + ... + 628.

2¹⁹⁷⁴⁴⁰ is an apocalyptic number.

197440 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 197440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235458).

197440 is an abundant number, since it is smaller than the sum of its proper divisors (273476).

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

197440 is an equidigital number, since it uses as much as digits as its factorization.

197440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 624 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 197440 is about 444.3422104640. The cubic root of 197440 is about 58.2297663458.

The spelling of 197440 in words is "one hundred ninety-seven thousand, four hundred forty".