1279439856 has 120 divisors (see below), whose sum is σ = 3810787344. Its totient is φ = 399329280.

The previous prime is 1279439851. The next prime is 1279439867. The reversal of 1279439856 is 6589349721.

1279439856 is a `hidden beast` number, since 127 + 9 + 439 + 85 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279439851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 515290 + ... + 517766.

Almost surely, 2^1279439856 is an apocalyptic number.

1279439856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1279439856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1905393672).

1279439856 is an abundant number, since it is smaller than the sum of its proper divisors (2531347488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1279439856 is a wasteful number, since it uses less digits than its factorization.

1279439856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2719 (or 2710 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 1279439856 is about 35769.2585329917. The cubic root of 1279439856 is about 1085.6086417852.

It can be divided in two parts, 12794 and 39856, that added together give a triangular number (52650 = T₃₂₄).

The spelling of 1279439856 in words is "one billion, two hundred seventy-nine million, four hundred thirty-nine thousand, eight hundred fifty-six".