1279663 has 8 divisors (see below), whose sum is σ = 1595520. Its totient is φ = 997080.

The previous prime is 1279661. The next prime is 1279667. The reversal of 1279663 is 3669721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1279663 - 2¹ = 1279661 is a prime.

It is a Duffinian number.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 8233 + ... + 8386.

It is an arithmetic number, because the mean of its divisors is an integer number (199440).

2^1279663 is an apocalyptic number.

1279663 is a deficient number, since it is larger than the sum of its proper divisors (315857).

1279663 is a wasteful number, since it uses less digits than its factorization.

1279663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16637.

The product of its digits is 13608, while the sum is 34.

The square root of 1279663 is about 1131.2219057285. The cubic root of 1279663 is about 108.5671750906.

The spelling of 1279663 in words is "one million, two hundred seventy-nine thousand, six hundred sixty-three".