1276221377 has 12 divisors (see below), whose sum is σ = 1297905840. Its totient is φ = 1254848112.

The previous prime is 1276221371. The next prime is 1276221437. The reversal of 1276221377 is 7731226721.

It is not a de Polignac number, because 1276221377 - 2¹⁰ = 1276220353 is a prime.

It is a super-2 number, since 2×1276221377² = 3257482006223552258, which contains 22 as substring.

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 1276221377.

It is not an unprimeable number, because it can be changed into a prime (1276221371) 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 11 ways as a sum of consecutive naturals, for example, 1936274 + ... + 1936932.

It is an arithmetic number, because the mean of its divisors is an integer number (108158820).

Almost surely, 2^1276221377 is an apocalyptic number.

It is an amenable number.

1276221377 is a deficient number, since it is larger than the sum of its proper divisors (21684463).

1276221377 is an equidigital number, since it uses as much as digits as its factorization.

1276221377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040 (or 931 counting only the distinct ones).

The product of its digits is 49392, while the sum is 38.

The square root of 1276221377 is about 35724.2407477052. The cubic root of 1276221377 is about 1084.6975809876.

The spelling of 1276221377 in words is "one billion, two hundred seventy-six million, two hundred twenty-one thousand, three hundred seventy-seven".