1276378825 has 12 divisors (see below), whose sum is σ = 1625486860. Its totient is φ = 993504960.

The previous prime is 1276378799. The next prime is 1276378837. The reversal of 1276378825 is 5288736721.

It can be written as a sum of positive squares in 6 ways, for example, as 43877376 + 1232501449 = 6624^2 + 35107^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1276378825 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 689010 + ... + 690859.

Almost surely, 2^1276378825 is an apocalyptic number.

It is an amenable number.

1276378825 is a deficient number, since it is larger than the sum of its proper divisors (349108035).

1276378825 is a wasteful number, since it uses less digits than its factorization.

1276378825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379916 (or 1379911 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 49.

The square root of 1276378825 is about 35726.4443374932. Note that the first 3 decimals coincide. The cubic root of 1276378825 is about 1084.7421856946.

The spelling of 1276378825 in words is "one billion, two hundred seventy-six million, three hundred seventy-eight thousand, eight hundred twenty-five".