1272003505 has 4 divisors (see below), whose sum is σ = 1526404212. Its totient is φ = 1017602800.

The previous prime is 1272003503. The next prime is 1272003521. The reversal of 1272003505 is 5053002721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 226321936 + 1045681569 = 15044^2 + 32337^2 .

It is not a de Polignac number, because 1272003505 - 2¹ = 1272003503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1272003505.

It is not an unprimeable number, because it can be changed into a prime (1272003503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127200346 + ... + 127200355.

It is an arithmetic number, because the mean of its divisors is an integer number (381601053).

Almost surely, 2^1272003505 is an apocalyptic number.

It is an amenable number.

1272003505 is a deficient number, since it is larger than the sum of its proper divisors (254400707).

1272003505 is an equidigital number, since it uses as much as digits as its factorization.

1272003505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254400706.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 1272003505 is about 35665.1581378802. The cubic root of 1272003505 is about 1083.5012981907.

The spelling of 1272003505 in words is "one billion, two hundred seventy-two million, three thousand, five hundred five".