1278818863 has 16 divisors (see below), whose sum is σ = 1549117440. Its totient is φ = 1030559616.

The previous prime is 1278818861. The next prime is 1278818903. The reversal of 1278818863 is 3688188721.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1278818863 - 2¹ = 1278818861 is a prime.

It is a super-2 number, since 2×1278818863² = 3270755368729225538, which contains 22 as substring.

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 1278818863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278818861) 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, 118470 + ... + 128812.

It is an arithmetic number, because the mean of its divisors is an integer number (96819840).

Almost surely, 2^1278818863 is an apocalyptic number.

1278818863 is a deficient number, since it is larger than the sum of its proper divisors (270298577).

1278818863 is a wasteful number, since it uses less digits than its factorization.

1278818863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11406.

The product of its digits is 1032192, while the sum is 52.

The square root of 1278818863 is about 35760.5769388582. The cubic root of 1278818863 is about 1085.4329752064.

The spelling of 1278818863 in words is "one billion, two hundred seventy-eight million, eight hundred eighteen thousand, eight hundred sixty-three".