1279823 has 2 divisors, whose sum is σ = 1279824. Its totient is φ = 1279822.

The previous prime is 1279819. The next prime is 1279843. The reversal of 1279823 is 3289721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1279823 - 2² = 1279819 is a prime.

It is a super-2 number, since 2×1279823² = 3275893822658, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1279823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1279813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639911 + 639912.

It is an arithmetic number, because the mean of its divisors is an integer number (639912).

2^1279823 is an apocalyptic number.

1279823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279823 is an equidigital number, since it uses as much as digits as its factorization.

1279823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 1279823 is about 1131.2926235064. The cubic root of 1279823 is about 108.5716997256.

It can be divided in two parts, 12798 and 23, that added together give a palindrome (12821).

The spelling of 1279823 in words is "one million, two hundred seventy-nine thousand, eight hundred twenty-three".