104391 has 12 divisors (see below), whose sum is σ = 172432. Its totient is φ = 59616.

The previous prime is 104383. The next prime is 104393. The reversal of 104391 is 193401.

It is not a de Polignac number, because 104391 - 2³ = 104383 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 (104393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 766 + ... + 891.

2¹⁰⁴³⁹¹ is an apocalyptic number.

104391 is a deficient number, since it is larger than the sum of its proper divisors (68041).

104391 is a wasteful number, since it uses less digits than its factorization.

104391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670 (or 1667 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 104391 is about 323.0959609775. The cubic root of 104391 is about 47.0855541456.

Adding to 104391 its reverse (193401), we get a palindrome (297792).

It can be divided in two parts, 10439 and 1, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 104391 in words is "one hundred four thousand, three hundred ninety-one".