191389 has 8 divisors (see below), whose sum is σ = 211968. Its totient is φ = 171360.

The previous prime is 191353. The next prime is 191413. The reversal of 191389 is 983191.

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

It is a cyclic number.

It is not a de Polignac number, because 191389 - 2¹⁵ = 158621 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191339) 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, 1329 + ... + 1465.

It is an arithmetic number, because the mean of its divisors is an integer number (26496).

2¹⁹¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

191389 is a deficient number, since it is larger than the sum of its proper divisors (20579).

191389 is a wasteful number, since it uses less digits than its factorization.

191389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275.

The product of its digits is 1944, while the sum is 31.

The square root of 191389 is about 437.4802852701. The cubic root of 191389 is about 57.6287223328.

It can be divided in two parts, 1913 and 89, that added together give a palindrome (2002).

The spelling of 191389 in words is "one hundred ninety-one thousand, three hundred eighty-nine".