1276506138 has 32 divisors (see below), whose sum is σ = 2574144000. Its totient is φ = 421991856.

The previous prime is 1276506097. The next prime is 1276506139. The reversal of 1276506138 is 8316056721.

It is a junction number, because it is equal to n+sod(n) for n = 1276506096 and 1276506105.

It is not an unprimeable number, because it can be changed into a prime (1276506139) 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 15 ways as a sum of consecutive naturals, for example, 584733 + ... + 586911.

It is an arithmetic number, because the mean of its divisors is an integer number (80442000).

Almost surely, 2^1276506138 is an apocalyptic number.

1276506138 is an abundant number, since it is smaller than the sum of its proper divisors (1297637862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1276506138 is a wasteful number, since it uses less digits than its factorization.

1276506138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 1276506138 is about 35728.2260684742. The cubic root of 1276506138 is about 1084.7782505336.

The spelling of 1276506138 in words is "one billion, two hundred seventy-six million, five hundred six thousand, one hundred thirty-eight".