197538 has 32 divisors (see below), whose sum is σ = 447552. Its totient is φ = 57600.

The previous prime is 197521. The next prime is 197539. The reversal of 197538 is 835791.

It is a super-2 number, since 2×197538² = 78042522888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 197499 and 197508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197539) by changing a digit.

197538 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 15 ways as a sum of consecutive naturals, for example, 2670 + ... + 2742.

It is an arithmetic number, because the mean of its divisors is an integer number (13986).

2¹⁹⁷⁵³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223776).

197538 is an abundant number, since it is smaller than the sum of its proper divisors (250014).

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

197538 is a wasteful number, since it uses less digits than its factorization.

197538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130.

The product of its digits is 7560, while the sum is 33.

The square root of 197538 is about 444.4524721497. The cubic root of 197538 is about 58.2393989316.

It can be divided in two parts, 19 and 7538, that added together give a palindrome (7557).

The spelling of 197538 in words is "one hundred ninety-seven thousand, five hundred thirty-eight".