12009156 has 12 divisors (see below), whose sum is σ = 28021392. Its totient is φ = 4003048.

The previous prime is 12009149. The next prime is 12009167. The reversal of 12009156 is 65190021.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500370 + ... + 500393.

It is an arithmetic number, because the mean of its divisors is an integer number (2335116).

Almost surely, 2^12009156 is an apocalyptic number.

It is an amenable number.

12009156 is an abundant number, since it is smaller than the sum of its proper divisors (16012236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12009156 is a wasteful number, since it uses less digits than its factorization.

12009156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000770 (or 1000768 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 12009156 is about 3465.4229179135. The cubic root of 12009156 is about 229.0010615055.

Adding to 12009156 its reverse (65190021), we get a palindrome (77199177).

The spelling of 12009156 in words is "twelve million, nine thousand, one hundred fifty-six".