1272073139 has 4 divisors (see below), whose sum is σ = 1315937760. Its totient is φ = 1228208520.

The previous prime is 1272073129. The next prime is 1272073147. The reversal of 1272073139 is 9313702721.

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

It is a cyclic number.

It is not a de Polignac number, because 1272073139 - 2²⁰ = 1271024563 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1272073099 and 1272073108.

It is not an unprimeable number, because it can be changed into a prime (1272073129) 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, 21932267 + ... + 21932324.

It is an arithmetic number, because the mean of its divisors is an integer number (328984440).

Almost surely, 2^1272073139 is an apocalyptic number.

1272073139 is a deficient number, since it is larger than the sum of its proper divisors (43864621).

1272073139 is an equidigital number, since it uses as much as digits as its factorization.

1272073139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43864620.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 1272073139 is about 35666.1343433796. The cubic root of 1272073139 is about 1083.5210694026.

The spelling of 1272073139 in words is "one billion, two hundred seventy-two million, seventy-three thousand, one hundred thirty-nine".