1301805 has 16 divisors (see below), whose sum is σ = 2314560. Its totient is φ = 694224.

The previous prime is 1301779. The next prime is 1301821. The reversal of 1301805 is 5081031.

It is a happy number.

It is not a de Polignac number, because 1301805 - 2¹⁰ = 1300781 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4687 + ... + 4956.

It is an arithmetic number, because the mean of its divisors is an integer number (144660).

2^1301805 is an apocalyptic number.

1301805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1301805 is a deficient number, since it is larger than the sum of its proper divisors (1012755).

1301805 is an equidigital number, since it uses as much as digits as its factorization.

1301805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9657 (or 9651 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1301805 is about 1140.9666953947. The cubic root of 1301805 is about 109.1897768476.

Adding to 1301805 its reverse (5081031), we get a palindrome (6382836).

The spelling of 1301805 in words is "one million, three hundred one thousand, eight hundred five".