1276132729 has 9 divisors (see below), whose sum is σ = 1290400527. Its totient is φ = 1262022144.

The previous prime is 1276132723. The next prime is 1276132747. The reversal of 1276132729 is 9272316721.

The square root of 1276132729 is 35723.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1256348025 + 19784704 = 35445^2 + 4448^2 .

It is not a de Polignac number, because 1276132729 - 2⁷ = 1276132601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1276132691 and 1276132700.

It is not an unprimeable number, because it can be changed into a prime (1276132723) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4965369 + ... + 4965625.

Almost surely, 2^1276132729 is an apocalyptic number.

1276132729 is the 35723-rd square number.

1276132729 is the 17862-nd centered octagonal number.

It is an amenable number.

1276132729 is a deficient number, since it is larger than the sum of its proper divisors (14267798).

1276132729 is an frugal number, since it uses more digits than its factorization.

1276132729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 396 counting only the distinct ones).

The product of its digits is 63504, while the sum is 40.

The cubic root of 1276132729 is about 1084.6724655702.

Multiplying 1276132729 by its product of digits (63504), we get a square (81039532822416 = 9002196²).

The spelling of 1276132729 in words is "one billion, two hundred seventy-six million, one hundred thirty-two thousand, seven hundred twenty-nine".