197391 has 8 divisors (see below), whose sum is σ = 277120. Its totient is φ = 124632.

The previous prime is 197389. The next prime is 197419. The reversal of 197391 is 193791.

197391 is nontrivially palindromic in base 14.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 197391 - 2¹ = 197389 is a prime.

It is a Duffinian number.

197391 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1675 + ... + 1788.

It is an arithmetic number, because the mean of its divisors is an integer number (34640).

2¹⁹⁷³⁹¹ is an apocalyptic number.

197391 is a deficient number, since it is larger than the sum of its proper divisors (79729).

197391 is a wasteful number, since it uses less digits than its factorization.

197391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485.

The product of its digits is 1701, while the sum is 30.

The square root of 197391 is about 444.2870693594. The cubic root of 197391 is about 58.2249488576.

Subtracting from 197391 its reverse (193791), we obtain a square (3600 = 60²).

The spelling of 197391 in words is "one hundred ninety-seven thousand, three hundred ninety-one".