1278439360 has 112 divisors (see below), whose sum is σ = 3465649152. Its totient is φ = 444646400.

The previous prime is 1278439319. The next prime is 1278439361. The reversal of 1278439360 is 639348721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278439361) 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, 73065 + ... + 88855.

It is an arithmetic number, because the mean of its divisors is an integer number (30943296).

Almost surely, 2^1278439360 is an apocalyptic number.

1278439360 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 1278439360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1732824576).

1278439360 is an abundant number, since it is smaller than the sum of its proper divisors (2187209792).

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

1278439360 is a wasteful number, since it uses less digits than its factorization.

1278439360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15842 (or 15832 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 1278439360 is about 35755.2703807425. The cubic root of 1278439360 is about 1085.3255933515.

The spelling of 1278439360 in words is "one billion, two hundred seventy-eight million, four hundred thirty-nine thousand, three hundred sixty".