1278872279 has 4 divisors (see below), whose sum is σ = 1279091184. Its totient is φ = 1278653376.

The previous prime is 1278872269. The next prime is 1278872281. The reversal of 1278872279 is 9722788721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1278872279 - 2⁴ = 1278872263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1278872279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278872269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100442 + ... + 112455.

It is an arithmetic number, because the mean of its divisors is an integer number (319772796).

Almost surely, 2^1278872279 is an apocalyptic number.

1278872279 is a deficient number, since it is larger than the sum of its proper divisors (218905).

1278872279 is an equidigital number, since it uses as much as digits as its factorization.

1278872279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218904.

The product of its digits is 1580544, while the sum is 53.

The square root of 1278872279 is about 35761.3237870188. The cubic root of 1278872279 is about 1085.4480877664.

The spelling of 1278872279 in words is "one billion, two hundred seventy-eight million, eight hundred seventy-two thousand, two hundred seventy-nine".