1279318320 has 320 divisors, whose sum is σ = 5072532480. Its totient is φ = 290304000.

The previous prime is 1279318309. The next prime is 1279318373. The reversal of 1279318320 is 238139721.

1279318320 is a `hidden beast` number, since 12 + 7 + 9 + 318 + 320 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 63 ways as a sum of consecutive naturals, for example, 3190120 + ... + 3190520.

It is an arithmetic number, because the mean of its divisors is an integer number (15851664).

Almost surely, 2^1279318320 is an apocalyptic number.

1279318320 is a gapful number since it is divisible by the number (10) 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 1279318320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2536266240).

1279318320 is an abundant number, since it is smaller than the sum of its proper divisors (3793214160).

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

1279318320 is a wasteful number, since it uses less digits than its factorization.

1279318320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1279318320 is about 35767.5596036408. The cubic root of 1279318320 is about 1085.5742661404.

It can be divided in two parts, 12793 and 18320, that added together give a palindrome (31113).

The spelling of 1279318320 in words is "one billion, two hundred seventy-nine million, three hundred eighteen thousand, three hundred twenty".