197428 has 24 divisors (see below), whose sum is σ = 431424. Its totient is φ = 76800.

The previous prime is 197423. The next prime is 197441. The reversal of 197428 is 824791.

It is a self number, because there is not a number n which added to its sum of digits gives 197428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197423) by changing a digit.

197428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13 + ... + 628.

It is an arithmetic number, because the mean of its divisors is an integer number (17976).

197428 is a Friedman number, since it can be written as 98714*2, using all its digits and the basic arithmetic operations.

2¹⁹⁷⁴²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215712).

197428 is an abundant number, since it is smaller than the sum of its proper divisors (233996).

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

197428 is a wasteful number, since it uses less digits than its factorization.

197428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 661 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 197428 is about 444.3287071527. The cubic root of 197428 is about 58.2285866265.

It can be divided in two parts, 1974 and 28, that added together give a palindrome (2002).

The spelling of 197428 in words is "one hundred ninety-seven thousand, four hundred twenty-eight".