1312805 has 16 divisors (see below), whose sum is σ = 1787520. Its totient is φ = 917568.

The previous prime is 1312789. The next prime is 1312813. The reversal of 1312805 is 5082131.

It is a cyclic number.

It is not a de Polignac number, because 1312805 - 2⁴ = 1312789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 704 + ... + 1766.

It is an arithmetic number, because the mean of its divisors is an integer number (111720).

2^1312805 is an apocalyptic number.

It is an amenable number.

1312805 is a deficient number, since it is larger than the sum of its proper divisors (474715).

1312805 is a wasteful number, since it uses less digits than its factorization.

1312805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1312805 is about 1145.7770289197. Note that the first 3 decimals coincide. The cubic root of 1312805 is about 109.4964588139.

Adding to 1312805 its reverse (5082131), we get a palindrome (6394936).

The spelling of 1312805 in words is "one million, three hundred twelve thousand, eight hundred five".