1272782265 has 16 divisors (see below), whose sum is σ = 2156243328. Its totient is φ = 638886656.

The previous prime is 1272782237. The next prime is 1272782267. The reversal of 1272782265 is 5622872721.

It is not a de Polignac number, because 1272782265 - 2⁹ = 1272781753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1272782267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2495397 + ... + 2495906.

It is an arithmetic number, because the mean of its divisors is an integer number (134765208).

Almost surely, 2^1272782265 is an apocalyptic number.

1272782265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1272782265 is a deficient number, since it is larger than the sum of its proper divisors (883461063).

1272782265 is a wasteful number, since it uses less digits than its factorization.

1272782265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4991328.

The product of its digits is 188160, while the sum is 42.

The square root of 1272782265 is about 35676.0741253855. The cubic root of 1272782265 is about 1083.7223707817.

The spelling of 1272782265 in words is "one billion, two hundred seventy-two million, seven hundred eighty-two thousand, two hundred sixty-five".