12009239 has 4 divisors (see below), whose sum is σ = 13101000. Its totient is φ = 10917480.

The previous prime is 12009233. The next prime is 12009329. The reversal of 12009239 is 93290021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93290021 = 11 ⋅8480911.

It is a cyclic number.

It is not a de Polignac number, because 12009239 - 2⁴ = 12009223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12009233) 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, 545864 + ... + 545885.

It is an arithmetic number, because the mean of its divisors is an integer number (3275250).

Almost surely, 2^12009239 is an apocalyptic number.

12009239 is a deficient number, since it is larger than the sum of its proper divisors (1091761).

12009239 is a wasteful number, since it uses less digits than its factorization.

12009239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091760.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 12009239 is about 3465.4348933431. The cubic root of 12009239 is about 229.0015890764.

The spelling of 12009239 in words is "twelve million, nine thousand, two hundred thirty-nine".