1286378755 has 16 divisors (see below), whose sum is σ = 1662693120. Its totient is φ = 952263648.

The previous prime is 1286378749. The next prime is 1286378777. The reversal of 1286378755 is 5578736821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1286378755 - 2³ = 1286378747 is a prime.

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, 153367 + ... + 161536.

It is an arithmetic number, because the mean of its divisors is an integer number (103918320).

Almost surely, 2^1286378755 is an apocalyptic number.

1286378755 is a deficient number, since it is larger than the sum of its proper divisors (376314365).

1286378755 is a wasteful number, since it uses less digits than its factorization.

1286378755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314970.

The product of its digits is 2822400, while the sum is 52.

The square root of 1286378755 is about 35866.1226647097. The cubic root of 1286378755 is about 1087.5676635576.

The spelling of 1286378755 in words is "one billion, two hundred eighty-six million, three hundred seventy-eight thousand, seven hundred fifty-five".