1276438740 has 48 divisors (see below), whose sum is σ = 3617103168. Its totient is φ = 336281344.

The previous prime is 1276438729. The next prime is 1276438763. The reversal of 1276438740 is 478346721.

It is a junction number, because it is equal to n+sod(n) for n = 1276438692 and 1276438701.

It is a congruent number.

It is an unprimeable number.

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, 123177 + ... + 133136.

It is an arithmetic number, because the mean of its divisors is an integer number (75356316).

Almost surely, 2^1276438740 is an apocalyptic number.

1276438740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1276438740 is an abundant number, since it is smaller than the sum of its proper divisors (2340664428).

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

1276438740 is a wasteful number, since it uses less digits than its factorization.

1276438740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256408 (or 256406 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 1276438740 is about 35727.2828521845. The cubic root of 1276438740 is about 1084.7591585321.

The spelling of 1276438740 in words is "one billion, two hundred seventy-six million, four hundred thirty-eight thousand, seven hundred forty".