1272726915 has 16 divisors (see below), whose sum is σ = 2106583200. Its totient is φ = 655380992.

The previous prime is 1272726911. The next prime is 1272726991. The reversal of 1272726915 is 5196272721.

It is a cyclic number.

It is not a de Polignac number, because 1272726915 - 2² = 1272726911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1272726911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1462470 + ... + 1463339.

It is an arithmetic number, because the mean of its divisors is an integer number (131661450).

Almost surely, 2^1272726915 is an apocalyptic number.

1272726915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1272726915 is a deficient number, since it is larger than the sum of its proper divisors (833856285).

1272726915 is a wasteful number, since it uses less digits than its factorization.

1272726915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2925846.

The product of its digits is 105840, while the sum is 42.

The square root of 1272726915 is about 35675.2983869792. The cubic root of 1272726915 is about 1083.7066611288.

The spelling of 1272726915 in words is "one billion, two hundred seventy-two million, seven hundred twenty-six thousand, nine hundred fifteen".