1278840896 has 14 divisors (see below), whose sum is σ = 2537700030. Its totient is φ = 639420416.

The previous prime is 1278840877. The next prime is 1278840931. The reversal of 1278840896 is 6980488721.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 940280896 + 338560000 = 30664^2 + 18400^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9990881 + ... + 9991008.

Almost surely, 2^1278840896 is an apocalyptic number.

1278840896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1278840896 is a deficient number, since it is larger than the sum of its proper divisors (1258859134).

1278840896 is an equidigital number, since it uses as much as digits as its factorization.

1278840896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19981901 (or 19981891 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 53.

The square root of 1278840896 is about 35760.8850002345. The cubic root of 1278840896 is about 1085.4392088772.

The spelling of 1278840896 in words is "one billion, two hundred seventy-eight million, eight hundred forty thousand, eight hundred ninety-six".