1244013539 has 12 divisors (see below), whose sum is σ = 1361069352. Its totient is φ = 1133052480.

The previous prime is 1244013517. The next prime is 1244013541. The reversal of 1244013539 is 9353104421.

It is not a de Polignac number, because 1244013539 - 2⁸ = 1244013283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1244013559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21737 + ... + 54410.

It is an arithmetic number, because the mean of its divisors is an integer number (113422446).

Almost surely, 2^1244013539 is an apocalyptic number.

1244013539 is a deficient number, since it is larger than the sum of its proper divisors (117055813).

1244013539 is an equidigital number, since it uses as much as digits as its factorization.

1244013539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76226 (or 76195 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1244013539 is about 35270.5761081386. The cubic root of 1244013539 is about 1075.4949338768.

The spelling of 1244013539 in words is "one billion, two hundred forty-four million, thirteen thousand, five hundred thirty-nine".