2156178 has 16 divisors (see below), whose sum is σ = 4566240. Its totient is φ = 676416.

The previous prime is 2156171. The next prime is 2156183. The reversal of 2156178 is 8716512.

It is a d-powerful number, because it can be written as 2²⁰ + 1 + 5² + 6⁷ + 1 + 7⁷ + 8⁴ .

It is not an unprimeable number, because it can be changed into a prime (2156171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10468 + ... + 10671.

It is an arithmetic number, because the mean of its divisors is an integer number (285390).

2^2156178 is an apocalyptic number.

2156178 is an abundant number, since it is smaller than the sum of its proper divisors (2410062).

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

2156178 is a wasteful number, since it uses less digits than its factorization.

2156178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21161.

The product of its digits is 3360, while the sum is 30.

The square root of 2156178 is about 1468.3929991661. The cubic root of 2156178 is about 129.1897933385.

The spelling of 2156178 in words is "two million, one hundred fifty-six thousand, one hundred seventy-eight".