1276123640 has 32 divisors (see below), whose sum is σ = 3132304560. Its totient is φ = 464044800.

The previous prime is 1276123613. The next prime is 1276123643. The reversal of 1276123640 is 463216721.

It is a junction number, because it is equal to n+sod(n) for n = 1276123597 and 1276123606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276123643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1449701 + ... + 1450580.

Almost surely, 2^1276123640 is an apocalyptic number.

1276123640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1276123640 is an abundant number, since it is smaller than the sum of its proper divisors (1856180920).

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

1276123640 is a wasteful number, since it uses less digits than its factorization.

1276123640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900303 (or 2900299 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 1276123640 is about 35722.8727848139. The cubic root of 1276123640 is about 1084.6698904432.

The spelling of 1276123640 in words is "one billion, two hundred seventy-six million, one hundred twenty-three thousand, six hundred forty".