1278130440 has 64 divisors (see below), whose sum is σ = 3859839360. Its totient is φ = 338572800.

The previous prime is 1278130429. The next prime is 1278130453. The reversal of 1278130440 is 440318721.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1278130398 and 1278130407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17149 + ... + 53388.

It is an arithmetic number, because the mean of its divisors is an integer number (60309990).

Almost surely, 2^1278130440 is an apocalyptic number.

1278130440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278130440 is an abundant number, since it is smaller than the sum of its proper divisors (2581708920).

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

1278130440 is a wasteful number, since it uses less digits than its factorization.

1278130440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70702 (or 70698 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 1278130440 is about 35750.9501971626. The cubic root of 1278130440 is about 1085.2381675411.

The spelling of 1278130440 in words is "one billion, two hundred seventy-eight million, one hundred thirty thousand, four hundred forty".