1279827216 has 100 divisors (see below), whose sum is σ = 3713490000. Its totient is φ = 425539008.

The previous prime is 1279827191. The next prime is 1279827253. The reversal of 1279827216 is 6127289721.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 645715 + ... + 647693.

It is an arithmetic number, because the mean of its divisors is an integer number (37134900).

Almost surely, 2^1279827216 is an apocalyptic number.

1279827216 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 1279827216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1856745000).

1279827216 is an abundant number, since it is smaller than the sum of its proper divisors (2433662784).

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

1279827216 is a wasteful number, since it uses less digits than its factorization.

1279827216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2498 (or 2483 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 1279827216 is about 35774.6728286926. The cubic root of 1279827216 is about 1085.7181894465.

The spelling of 1279827216 in words is "one billion, two hundred seventy-nine million, eight hundred twenty-seven thousand, two hundred sixteen".