104905 has 4 divisors (see below), whose sum is σ = 125892. Its totient is φ = 83920.

The previous prime is 104891. The next prime is 104911. The reversal of 104905 is 509401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509401 = 67 ⋅7603.

It can be written as a sum of positive squares in 2 ways, for example, as 45369 + 59536 = 213^2 + 244^2 .

It is not a de Polignac number, because 104905 - 2⁹ = 104393 is a prime.

It is a super-2 number, since 2×104905² = 22010118050, which contains 22 as substring.

It is a Duffinian number.

104905 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10486 + ... + 10495.

It is an arithmetic number, because the mean of its divisors is an integer number (31473).

2¹⁰⁴⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

104905 is a deficient number, since it is larger than the sum of its proper divisors (20987).

104905 is an equidigital number, since it uses as much as digits as its factorization.

104905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20986.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 104905 is about 323.8904135661. The cubic root of 104905 is about 47.1627075441.

Subtracting 104905 from its reverse (509401), we obtain a square (404496 = 636²).

The spelling of 104905 in words is "one hundred four thousand, nine hundred five".