1308805 has 4 divisors (see below), whose sum is σ = 1570572. Its totient is φ = 1047040.

The previous prime is 1308803. The next prime is 1308829. The reversal of 1308805 is 5088031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5088031 = 13 ⋅391387.

It can be written as a sum of positive squares in 2 ways, for example, as 231361 + 1077444 = 481^2 + 1038^2 .

It is not a de Polignac number, because 1308805 - 2¹ = 1308803 is a prime.

It is a Duffinian number.

1308805 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1308805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1308803) 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 3 ways as a sum of consecutive naturals, for example, 130876 + ... + 130885.

It is an arithmetic number, because the mean of its divisors is an integer number (392643).

2^1308805 is an apocalyptic number.

It is an amenable number.

1308805 is a deficient number, since it is larger than the sum of its proper divisors (261767).

1308805 is an equidigital number, since it uses as much as digits as its factorization.

1308805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261766.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1308805 is about 1144.0301569452. The cubic root of 1308805 is about 109.3851370196.

The spelling of 1308805 in words is "one million, three hundred eight thousand, eight hundred five".