12270156 has 12 divisors (see below), whose sum is σ = 28630392. Its totient is φ = 4090048.

The previous prime is 12270133. The next prime is 12270157. The reversal of 12270156 is 65107221.

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

It is a super-4 number, since 4×12270156⁴ (a number of 29 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (12270157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511245 + ... + 511268.

It is an arithmetic number, because the mean of its divisors is an integer number (2385866).

Almost surely, 2^12270156 is an apocalyptic number.

It is an amenable number.

12270156 is an abundant number, since it is smaller than the sum of its proper divisors (16360236).

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

12270156 is a wasteful number, since it uses less digits than its factorization.

12270156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022520 (or 1022518 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 12270156 is about 3502.8782451007. The cubic root of 12270156 is about 230.6481779130.

Adding to 12270156 its reverse (65107221), we get a palindrome (77377377).

The spelling of 12270156 in words is "twelve million, two hundred seventy thousand, one hundred fifty-six".