1276438745 has 8 divisors (see below), whose sum is σ = 1557688320. Its totient is φ = 1003843120.

The previous prime is 1276438729. The next prime is 1276438763. The reversal of 1276438745 is 5478346721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1276438745 - 2⁴ = 1276438729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1276438745.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2163161 + ... + 2163750.

It is an arithmetic number, because the mean of its divisors is an integer number (194711040).

Almost surely, 2^1276438745 is an apocalyptic number.

It is an amenable number.

1276438745 is a deficient number, since it is larger than the sum of its proper divisors (281249575).

1276438745 is an equidigital number, since it uses as much as digits as its factorization.

1276438745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4326975.

The product of its digits is 1128960, while the sum is 47.

The square root of 1276438745 is about 35727.2829221591. The cubic root of 1276438745 is about 1084.7591599485.

The spelling of 1276438745 in words is "one billion, two hundred seventy-six million, four hundred thirty-eight thousand, seven hundred forty-five".