12156210 has 64 divisors (see below), whose sum is σ = 35372160. Its totient is φ = 2946240.

The previous prime is 12156203. The next prime is 12156211. The reversal of 12156210 is 1265121.

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

It is not an unprimeable number, because it can be changed into a prime (12156211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 924 + ... + 5016.

It is an arithmetic number, because the mean of its divisors is an integer number (552690).

Almost surely, 2^12156210 is an apocalyptic number.

12156210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12156210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17686080).

12156210 is an abundant number, since it is smaller than the sum of its proper divisors (23215950).

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

12156210 is a wasteful number, since it uses less digits than its factorization.

12156210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4120 (or 4114 counting only the distinct ones).

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

The square root of 12156210 is about 3486.5756839627. The cubic root of 12156210 is about 229.9319899736.

The spelling of 12156210 in words is "twelve million, one hundred fifty-six thousand, two hundred ten".