2156166 has 16 divisors (see below), whose sum is σ = 4791600. Its totient is φ = 718704.

The previous prime is 2156159. The next prime is 2156171. The reversal of 2156166 is 6616512.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19911 + ... + 20018.

It is an arithmetic number, because the mean of its divisors is an integer number (299475).

2^2156166 is an apocalyptic number.

2156166 is an abundant number, since it is smaller than the sum of its proper divisors (2635434).

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

2156166 is a wasteful number, since it uses less digits than its factorization.

2156166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39940 (or 39934 counting only the distinct ones).

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

The square root of 2156166 is about 1468.3889130608. The cubic root of 2156166 is about 129.1895536736.

The spelling of 2156166 in words is "two million, one hundred fifty-six thousand, one hundred sixty-six".