1272240439 has 4 divisors (see below), whose sum is σ = 1272807880. Its totient is φ = 1271673000.

The previous prime is 1272240433. The next prime is 1272240491. The reversal of 1272240439 is 9340422721.

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 1272240439 - 2¹¹ = 1272238391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272240433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280344 + ... + 284845.

It is an arithmetic number, because the mean of its divisors is an integer number (318201970).

Almost surely, 2^1272240439 is an apocalyptic number.

1272240439 is a deficient number, since it is larger than the sum of its proper divisors (567441).

1272240439 is an equidigital number, since it uses as much as digits as its factorization.

1272240439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567440.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 1272240439 is about 35668.4796283778. The cubic root of 1272240439 is about 1083.5685680155.

The spelling of 1272240439 in words is "one billion, two hundred seventy-two million, two hundred forty thousand, four hundred thirty-nine".