12136439 has 4 divisors (see below), whose sum is σ = 13870224. Its totient is φ = 10402656.

The previous prime is 12136403. The next prime is 12136441. The reversal of 12136439 is 93463121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93463121 = 3733 ⋅25037.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12136439 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 (12136489) 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 3 ways as a sum of consecutive naturals, for example, 866882 + ... + 866895.

It is an arithmetic number, because the mean of its divisors is an integer number (3467556).

Almost surely, 2^12136439 is an apocalyptic number.

12136439 is a deficient number, since it is larger than the sum of its proper divisors (1733785).

12136439 is an equidigital number, since it uses as much as digits as its factorization.

12136439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733784.

The product of its digits is 3888, while the sum is 29.

The square root of 12136439 is about 3483.7392267505. The cubic root of 12136439 is about 229.8072676533.

The spelling of 12136439 in words is "twelve million, one hundred thirty-six thousand, four hundred thirty-nine".