1265376878 has 16 divisors (see below), whose sum is σ = 2097096480. Its totient is φ = 569581056.

The previous prime is 1265376859. The next prime is 1265376881. The reversal of 1265376878 is 8786735621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 808283 + ... + 809846.

It is an arithmetic number, because the mean of its divisors is an integer number (131068530).

Almost surely, 2^1265376878 is an apocalyptic number.

1265376878 is a deficient number, since it is larger than the sum of its proper divisors (831719602).

1265376878 is a wasteful number, since it uses less digits than its factorization.

1265376878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618171.

The product of its digits is 3386880, while the sum is 53.

The square root of 1265376878 is about 35572.1362585943. The cubic root of 1265376878 is about 1081.6164859309.

The spelling of 1265376878 in words is "one billion, two hundred sixty-five million, three hundred seventy-six thousand, eight hundred seventy-eight".