197724 has 12 divisors (see below), whose sum is σ = 461384. Its totient is φ = 65904.

The previous prime is 197713. The next prime is 197741. The reversal of 197724 is 427791.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 197691 and 197700.

It is a congruent number.

It is an unprimeable number.

197724 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 3 ways as a sum of consecutive naturals, for example, 8227 + ... + 8250.

2¹⁹⁷⁷²⁴ is an apocalyptic number.

It is an amenable number.

197724 is an abundant number, since it is smaller than the sum of its proper divisors (263660).

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

197724 is a wasteful number, since it uses less digits than its factorization.

197724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16484 (or 16482 counting only the distinct ones).

The product of its digits is 3528, while the sum is 30.

The square root of 197724 is about 444.6616691373. The cubic root of 197724 is about 58.2576724284.

The spelling of 197724 in words is "one hundred ninety-seven thousand, seven hundred twenty-four".