12012639 has 4 divisors (see below), whose sum is σ = 16016856. Its totient is φ = 8008424.

The previous prime is 12012629. The next prime is 12012643. The reversal of 12012639 is 93621021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12012639 - 2⁵ = 12012607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2002104 + ... + 2002109.

It is an arithmetic number, because the mean of its divisors is an integer number (4004214).

Almost surely, 2^12012639 is an apocalyptic number.

12012639 is a deficient number, since it is larger than the sum of its proper divisors (4004217).

12012639 is an equidigital number, since it uses as much as digits as its factorization.

12012639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004216.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 12012639 is about 3465.9254175472. The cubic root of 12012639 is about 229.0231983262.

The spelling of 12012639 in words is "twelve million, twelve thousand, six hundred thirty-nine".