1312666 has 4 divisors (see below), whose sum is σ = 1969002. Its totient is φ = 656332.

The previous prime is 1312657. The next prime is 1312667. The reversal of 1312666 is 6662131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1274641 + 38025 = 1129^2 + 195^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1312666.

It is not an unprimeable number, because it can be changed into a prime (1312667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328165 + ... + 328168.

2^1312666 is an apocalyptic number.

1312666 is a deficient number, since it is larger than the sum of its proper divisors (656336).

1312666 is an equidigital number, since it uses as much as digits as its factorization.

1312666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656335.

The product of its digits is 1296, while the sum is 25.

The square root of 1312666 is about 1145.7163697879. The cubic root of 1312666 is about 109.4925941768.

Adding to 1312666 its reverse (6662131), we get a palindrome (7974797).

The spelling of 1312666 in words is "one million, three hundred twelve thousand, six hundred sixty-six".