11521439 has 16 divisors (see below), whose sum is σ = 12441600. Its totient is φ = 10649184.

The previous prime is 11521421. The next prime is 11521453. The reversal of 11521439 is 93412511.

It is a cyclic number.

It is not a de Polignac number, because 11521439 - 2²⁰ = 10472863 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 (11521039) 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 15 ways as a sum of consecutive naturals, for example, 107624 + ... + 107730.

It is an arithmetic number, because the mean of its divisors is an integer number (777600).

Almost surely, 2^11521439 is an apocalyptic number.

11521439 is a deficient number, since it is larger than the sum of its proper divisors (920161).

11521439 is a wasteful number, since it uses less digits than its factorization.

11521439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262.

The product of its digits is 1080, while the sum is 26.

The square root of 11521439 is about 3394.3245277964. The cubic root of 11521439 is about 225.8580503652.

The spelling of 11521439 in words is "eleven million, five hundred twenty-one thousand, four hundred thirty-nine".