1276435138 has 16 divisors (see below), whose sum is σ = 2089705536. Its totient is φ = 579921840.

The previous prime is 1276435133. The next prime is 1276435151. The reversal of 1276435138 is 8315346721.

It is a self number, because there is not a number n which added to its sum of digits gives 1276435138.

It is not an unprimeable number, because it can be changed into a prime (1276435133) 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, 37795 + ... + 63097.

It is an arithmetic number, because the mean of its divisors is an integer number (130606596).

Almost surely, 2^1276435138 is an apocalyptic number.

1276435138 is a deficient number, since it is larger than the sum of its proper divisors (813270398).

1276435138 is a wasteful number, since it uses less digits than its factorization.

1276435138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27609.

The product of its digits is 120960, while the sum is 40.

The square root of 1276435138 is about 35727.2324424941. The cubic root of 1276435138 is about 1084.7581381656.

The spelling of 1276435138 in words is "one billion, two hundred seventy-six million, four hundred thirty-five thousand, one hundred thirty-eight".