1276881379 has 4 divisors (see below), whose sum is σ = 1292265576. Its totient is φ = 1261497184.

The previous prime is 1276881367. The next prime is 1276881449. The reversal of 1276881379 is 9731886721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1276881379 - 2⁷ = 1276881251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1276881079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7691974 + ... + 7692139.

It is an arithmetic number, because the mean of its divisors is an integer number (323066394).

Almost surely, 2^1276881379 is an apocalyptic number.

1276881379 is a deficient number, since it is larger than the sum of its proper divisors (15384197).

1276881379 is an equidigital number, since it uses as much as digits as its factorization.

1276881379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15384196.

The product of its digits is 1016064, while the sum is 52.

The square root of 1276881379 is about 35733.4770068629. The cubic root of 1276881379 is about 1084.8845337140.

The spelling of 1276881379 in words is "one billion, two hundred seventy-six million, eight hundred eighty-one thousand, three hundred seventy-nine".