12006639 has 6 divisors (see below), whose sum is σ = 17342936. Its totient is φ = 8004420.

The previous prime is 12006623. The next prime is 12006649. The reversal of 12006639 is 93660021.

It is a happy number.

12006639 is a `hidden beast` number, since 1 + 20 + 0 + 6 + 639 = 666.

It is not a de Polignac number, because 12006639 - 2⁴ = 12006623 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 (12006619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 667027 + ... + 667044.

Almost surely, 2^12006639 is an apocalyptic number.

12006639 is a deficient number, since it is larger than the sum of its proper divisors (5336297).

12006639 is a wasteful number, since it uses less digits than its factorization.

12006639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334077 (or 1334074 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 12006639 is about 3465.0597397448. The cubic root of 12006639 is about 228.9850616038.

The spelling of 12006639 in words is "twelve million, six thousand, six hundred thirty-nine".