105439 has 4 divisors (see below), whose sum is σ = 106624. Its totient is φ = 104256.

The previous prime is 105437. The next prime is 105449. The reversal of 105439 is 934501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 105439 - 2¹ = 105437 is a prime.

It is a super-2 number, since 2×105439² = 22234765442, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105437) 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 3 ways as a sum of consecutive naturals, for example, 447 + ... + 640.

It is an arithmetic number, because the mean of its divisors is an integer number (26656).

2¹⁰⁵⁴³⁹ is an apocalyptic number.

105439 is a deficient number, since it is larger than the sum of its proper divisors (1185).

105439 is an equidigital number, since it uses as much as digits as its factorization.

105439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 105439 is about 324.7137200674. The cubic root of 105439 is about 47.2425965650.

The spelling of 105439 in words is "one hundred five thousand, four hundred thirty-nine".