191439 has 12 divisors (see below), whose sum is σ = 280800. Its totient is φ = 125664.

The previous prime is 191413. The next prime is 191441. The reversal of 191439 is 934191.

191439 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 191439 - 2¹¹ = 189391 is a prime.

191439 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 682 + ... + 920.

It is an arithmetic number, because the mean of its divisors is an integer number (23400).

2¹⁹¹⁴³⁹ is an apocalyptic number.

191439 is a deficient number, since it is larger than the sum of its proper divisors (89361).

191439 is a wasteful number, since it uses less digits than its factorization.

191439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334 (or 331 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 191439 is about 437.5374269705. The cubic root of 191439 is about 57.6337403594.

It can be divided in two parts, 1914 and 39, that added together give a triangular number (1953 = T₆₂).

The spelling of 191439 in words is "one hundred ninety-one thousand, four hundred thirty-nine".