12012156 has 36 divisors (see below), whose sum is σ = 32701032. Its totient is φ = 3695904.

The previous prime is 12012137. The next prime is 12012157. The reversal of 12012156 is 65121021.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12366 + ... + 13301.

It is an arithmetic number, because the mean of its divisors is an integer number (908362).

Almost surely, 2^12012156 is an apocalyptic number.

It is an amenable number.

12012156 is an abundant number, since it is smaller than the sum of its proper divisors (20688876).

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

12012156 is a wasteful number, since it uses less digits than its factorization.

12012156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25690 (or 25685 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 12012156 is about 3465.8557384865. The cubic root of 12012156 is about 229.0201287901.

Adding to 12012156 its reverse (65121021), we get a palindrome (77133177).

The spelling of 12012156 in words is "twelve million, twelve thousand, one hundred fifty-six".