105805439 has 4 divisors (see below), whose sum is σ = 105828624. Its totient is φ = 105782256.

The previous prime is 105805423. The next prime is 105805463. The reversal of 105805439 is 934508501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934508501 = 27077 ⋅34513.

It is a cyclic number.

It is not a de Polignac number, because 105805439 - 2⁴ = 105805423 is a prime.

It is a super-2 number, since 2×105805439² = 22389581843965442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105805399 and 105805408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105805409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2222 + ... + 14715.

It is an arithmetic number, because the mean of its divisors is an integer number (26457156).

Almost surely, 2^105805439 is an apocalyptic number.

105805439 is a deficient number, since it is larger than the sum of its proper divisors (23185).

105805439 is an equidigital number, since it uses as much as digits as its factorization.

105805439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23184.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 105805439 is about 10286.1770838344. The cubic root of 105805439 is about 472.9726170740.

The spelling of 105805439 in words is "one hundred five million, eight hundred five thousand, four hundred thirty-nine".