197797 has 4 divisors (see below), whose sum is σ = 199360. Its totient is φ = 196236.

The previous prime is 197779. The next prime is 197803. The reversal of 197797 is 797791.

It is a happy number.

197797 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197767) by changing a digit.

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, 573 + ... + 850.

It is an arithmetic number, because the mean of its divisors is an integer number (49840).

2¹⁹⁷⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

197797 is a deficient number, since it is larger than the sum of its proper divisors (1563).

197797 is a wasteful number, since it uses less digits than its factorization.

197797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562.

The product of its digits is 27783, while the sum is 40.

The square root of 197797 is about 444.7437464428. The cubic root of 197797 is about 58.2648411532.

The spelling of 197797 in words is "one hundred ninety-seven thousand, seven hundred ninety-seven".