1278865841 has 8 divisors (see below), whose sum is σ = 1397432064. Its totient is φ = 1160683920.

The previous prime is 1278865837. The next prime is 1278865853. The reversal of 1278865841 is 1485688721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1278865841 - 2² = 1278865837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1278865841.

It is not an unprimeable number, because it can be changed into a prime (1278865811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89090 + ... + 102443.

It is an arithmetic number, because the mean of its divisors is an integer number (174679008).

Almost surely, 2^1278865841 is an apocalyptic number.

1278865841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1278865841 is a deficient number, since it is larger than the sum of its proper divisors (118566223).

1278865841 is a wasteful number, since it uses less digits than its factorization.

1278865841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192151.

The product of its digits is 860160, while the sum is 50.

The square root of 1278865841 is about 35761.2337734592. The cubic root of 1278865841 is about 1085.4462663371.

The spelling of 1278865841 in words is "one billion, two hundred seventy-eight million, eight hundred sixty-five thousand, eight hundred forty-one".