1208905 has 4 divisors (see below), whose sum is σ = 1450692. Its totient is φ = 967120.

The previous prime is 1208873. The next prime is 1208927. The reversal of 1208905 is 5098021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5098021 = 593 ⋅8597.

It can be written as a sum of positive squares in 2 ways, for example, as 881721 + 327184 = 939^2 + 572^2 .

It is not a de Polignac number, because 1208905 - 2⁵ = 1208873 is a prime.

It is a super-2 number, since 2×1208905² = 2922902598050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1208905.

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, 120886 + ... + 120895.

It is an arithmetic number, because the mean of its divisors is an integer number (362673).

2^1208905 is an apocalyptic number.

It is an amenable number.

1208905 is a deficient number, since it is larger than the sum of its proper divisors (241787).

1208905 is an equidigital number, since it uses as much as digits as its factorization.

1208905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241786.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1208905 is about 1099.5021600706. The cubic root of 1208905 is about 106.5280697757.

It can be divided in two parts, 120890 and 5, that multiplied together give a triangular number (604450 = T₁₀₉₉).

The spelling of 1208905 in words is "one million, two hundred eight thousand, nine hundred five".