12009287 has 4 divisors (see below), whose sum is σ = 12036840. Its totient is φ = 11981736.

The previous prime is 12009233. The next prime is 12009329. The reversal of 12009287 is 78290021.

It is a happy number.

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 12009287 - 2⁶ = 12009223 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 (12003287) 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, 13112 + ... + 13997.

It is an arithmetic number, because the mean of its divisors is an integer number (3009210).

Almost surely, 2^12009287 is an apocalyptic number.

12009287 is a deficient number, since it is larger than the sum of its proper divisors (27553).

12009287 is an equidigital number, since it uses as much as digits as its factorization.

12009287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27552.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 12009287 is about 3465.4418188739. The cubic root of 12009287 is about 229.0018941765.

The spelling of 12009287 in words is "twelve million, nine thousand, two hundred eighty-seven".