1279666 has 4 divisors (see below), whose sum is σ = 1919502. Its totient is φ = 639832.

The previous prime is 1279661. The next prime is 1279667. The reversal of 1279666 is 6669721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6669721 = 947 ⋅7043.

It can be written as a sum of positive squares in only one way, i.e., 748225 + 531441 = 865^2 + 729^2 .

It is not an unprimeable number, because it can be changed into a prime (1279661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319915 + ... + 319918.

2^1279666 is an apocalyptic number.

1279666 is a deficient number, since it is larger than the sum of its proper divisors (639836).

1279666 is an equidigital number, since it uses as much as digits as its factorization.

1279666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639835.

The product of its digits is 27216, while the sum is 37.

The square root of 1279666 is about 1131.2232317275. The cubic root of 1279666 is about 108.5672599310.

The spelling of 1279666 in words is "one million, two hundred seventy-nine thousand, six hundred sixty-six".