1278260384 has 12 divisors (see below), whose sum is σ = 2516575194. Its totient is φ = 639130176.

The previous prime is 1278260383. The next prime is 1278260393. The reversal of 1278260384 is 4830628721.

It can be written as a sum of positive squares in only one way, i.e., 664608400 + 613651984 = 25780^2 + 24772^2 .

It is not an unprimeable number, because it can be changed into a prime (1278260383) by changing a digit.

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 as a sum of consecutive naturals, namely, 19972787 + ... + 19972850.

Almost surely, 2^1278260384 is an apocalyptic number.

It is an amenable number.

1278260384 is a deficient number, since it is larger than the sum of its proper divisors (1238314810).

1278260384 is an equidigital number, since it uses as much as digits as its factorization.

1278260384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39945647 (or 39945639 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 1278260384 is about 35752.7675012718. The cubic root of 1278260384 is about 1085.2749440195.

The spelling of 1278260384 in words is "one billion, two hundred seventy-eight million, two hundred sixty thousand, three hundred eighty-four".