1276538445 has 72 divisors (see below), whose sum is σ = 2771974296. Its totient is φ = 538659072.

The previous prime is 1276538407. The next prime is 1276538467. The reversal of 1276538445 is 5448356721.

1276538445 is a `hidden beast` number, since 1 + 2 + 76 + 538 + 4 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 34821801 + 1241716644 = 5901^2 + 35238^2 .

It is not a de Polignac number, because 1276538445 - 2⁷ = 1276538317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1276538445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6399 + ... + 50931.

It is an arithmetic number, because the mean of its divisors is an integer number (38499643).

Almost surely, 2^1276538445 is an apocalyptic number.

1276538445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1276538445 is an abundant number, since it is smaller than the sum of its proper divisors (1495435851).

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

1276538445 is a wasteful number, since it uses less digits than its factorization.

1276538445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44571 (or 44561 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 1276538445 is about 35728.6781871370. The cubic root of 1276538445 is about 1084.7874019808.

The spelling of 1276538445 in words is "one billion, two hundred seventy-six million, five hundred thirty-eight thousand, four hundred forty-five".