1318666 has 4 divisors (see below), whose sum is σ = 1978002. Its totient is φ = 659332.

The previous prime is 1318663. The next prime is 1318697. The reversal of 1318666 is 6668131.

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., 863041 + 455625 = 929^2 + 675^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1318661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329665 + ... + 329668.

2^1318666 is an apocalyptic number.

1318666 is a deficient number, since it is larger than the sum of its proper divisors (659336).

1318666 is an equidigital number, since it uses as much as digits as its factorization.

1318666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659335.

The product of its digits is 5184, while the sum is 31.

The square root of 1318666 is about 1148.3318335743. The cubic root of 1318666 is about 109.6591654017.

The spelling of 1318666 in words is "one million, three hundred eighteen thousand, six hundred sixty-six".