2178156 has 12 divisors (see below), whose sum is σ = 5082392. Its totient is φ = 726048.

The previous prime is 2178151. The next prime is 2178157. The reversal of 2178156 is 6518712.

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

It is not an unprimeable number, because it can be changed into a prime (2178151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90745 + ... + 90768.

2^2178156 is an apocalyptic number.

It is an amenable number.

2178156 is an abundant number, since it is smaller than the sum of its proper divisors (2904236).

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

2178156 is a wasteful number, since it uses less digits than its factorization.

2178156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181520 (or 181518 counting only the distinct ones).

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

The square root of 2178156 is about 1475.8577167193. The cubic root of 2178156 is about 129.6272557368.

The spelling of 2178156 in words is "two million, one hundred seventy-eight thousand, one hundred fifty-six".