1276138799 has 8 divisors (see below), whose sum is σ = 1385126400. Its totient is φ = 1168697376.

The previous prime is 1276138771. The next prime is 1276138889. The reversal of 1276138799 is 9978316721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1276138799 - 2⁸ = 1276138543 is a prime.

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 1276138799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276138999) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 384824 + ... + 388125.

It is an arithmetic number, because the mean of its divisors is an integer number (173140800).

Almost surely, 2^1276138799 is an apocalyptic number.

1276138799 is a deficient number, since it is larger than the sum of its proper divisors (108987601).

1276138799 is a wasteful number, since it uses less digits than its factorization.

1276138799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773089.

The product of its digits is 1143072, while the sum is 53.

The square root of 1276138799 is about 35723.0849591689. The cubic root of 1276138799 is about 1084.6741853368.

The spelling of 1276138799 in words is "one billion, two hundred seventy-six million, one hundred thirty-eight thousand, seven hundred ninety-nine".