12661439 has 8 divisors (see below), whose sum is σ = 14558208. Its totient is φ = 10786680.

The previous prime is 12661433. The next prime is 12661469. The reversal of 12661439 is 93416621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12661439 - 2⁸ = 12661183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4247 + ... + 6584.

It is an arithmetic number, because the mean of its divisors is an integer number (1819776).

Almost surely, 2^12661439 is an apocalyptic number.

12661439 is a deficient number, since it is larger than the sum of its proper divisors (1896769).

12661439 is a wasteful number, since it uses less digits than its factorization.

12661439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11005.

The product of its digits is 7776, while the sum is 32.

The square root of 12661439 is about 3558.2915844545. The cubic root of 12661439 is about 233.0742823445.

The spelling of 12661439 in words is "twelve million, six hundred sixty-one thousand, four hundred thirty-nine".