1279678223 has 16 divisors (see below), whose sum is σ = 1315167840. Its totient is φ = 1244829696.

The previous prime is 1279678219. The next prime is 1279678243. The reversal of 1279678223 is 3228769721.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1279678223 - 2² = 1279678219 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 (1279678243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1959365 + ... + 1960017.

It is an arithmetic number, because the mean of its divisors is an integer number (82197990).

Almost surely, 2^1279678223 is an apocalyptic number.

1279678223 is a deficient number, since it is larger than the sum of its proper divisors (35489617).

1279678223 is an equidigital number, since it uses as much as digits as its factorization.

1279678223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066.

The product of its digits is 508032, while the sum is 47.

The square root of 1279678223 is about 35772.5903870547. The cubic root of 1279678223 is about 1085.6760559756.

It can be divided in two parts, 12796 and 78223, that added together give a palindrome (91019).

The spelling of 1279678223 in words is "one billion, two hundred seventy-nine million, six hundred seventy-eight thousand, two hundred twenty-three".