1312305 has 16 divisors (see below), whose sum is σ = 2125440. Its totient is φ = 691328.

The previous prime is 1312303. The next prime is 1312319. The reversal of 1312305 is 5032131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1312305 - 2¹ = 1312303 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

1312305 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1312301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 844 + ... + 1826.

It is an arithmetic number, because the mean of its divisors is an integer number (132840).

2^1312305 is an apocalyptic number.

1312305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1312305 is a deficient number, since it is larger than the sum of its proper divisors (813135).

1312305 is an equidigital number, since it uses as much as digits as its factorization.

1312305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 1312305 is about 1145.5588156005. The cubic root of 1312305 is about 109.4825559669.

Adding to 1312305 its reverse (5032131), we get a palindrome (6344436).

The spelling of 1312305 in words is "one million, three hundred twelve thousand, three hundred five".