2166156 has 48 divisors (see below), whose sum is σ = 5806080. Its totient is φ = 697680.

The previous prime is 2166137. The next prime is 2166161. The reversal of 2166156 is 6516612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3025 + ... + 3671.

It is an arithmetic number, because the mean of its divisors is an integer number (120960).

2^2166156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2903040).

2166156 is an abundant number, since it is smaller than the sum of its proper divisors (3639924).

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

2166156 is a wasteful number, since it uses less digits than its factorization.

2166156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691 (or 683 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 2166156 is about 1471.7866693241. The cubic root of 2166156 is about 129.3887677010.

The spelling of 2166156 in words is "two million, one hundred sixty-six thousand, one hundred fifty-six".