12256139 has 16 divisors (see below), whose sum is σ = 14592000. Its totient is φ = 10075104.

The previous prime is 12256117. The next prime is 12256147. The reversal of 12256139 is 93165221.

12256139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12256139 - 2¹² = 12252043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12256039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20162 + ... + 20760.

It is an arithmetic number, because the mean of its divisors is an integer number (912000).

Almost surely, 2^12256139 is an apocalyptic number.

12256139 is a deficient number, since it is larger than the sum of its proper divisors (2335861).

12256139 is an equidigital number, since it uses as much as digits as its factorization.

12256139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722.

The product of its digits is 3240, while the sum is 29.

The square root of 12256139 is about 3500.8768901520. The cubic root of 12256139 is about 230.5603162923.

The spelling of 12256139 in words is "twelve million, two hundred fifty-six thousand, one hundred thirty-nine".