1278876399 has 16 divisors (see below), whose sum is σ = 1767337440. Its totient is φ = 821923200.

The previous prime is 1278876397. The next prime is 1278876413. The reversal of 1278876399 is 9936788721.

It is not a de Polignac number, because 1278876399 - 2¹ = 1278876397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278876397) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 40752 + ... + 64949.

It is an arithmetic number, because the mean of its divisors is an integer number (110458590).

Almost surely, 2^1278876399 is an apocalyptic number.

1278876399 is a deficient number, since it is larger than the sum of its proper divisors (488461041).

1278876399 is a wasteful number, since it uses less digits than its factorization.

1278876399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105850.

The product of its digits is 9144576, while the sum is 60.

The square root of 1278876399 is about 35761.3813911040. The cubic root of 1278876399 is about 1085.4492533875.

The spelling of 1278876399 in words is "one billion, two hundred seventy-eight million, eight hundred seventy-six thousand, three hundred ninety-nine".