2156756 has 48 divisors (see below), whose sum is σ = 4790016. Its totient is φ = 827904.

The previous prime is 2156753. The next prime is 2156761. The reversal of 2156756 is 6576512.

2156756 = 26² + 27² + ... + 186².

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10850 + ... + 11046.

It is an arithmetic number, because the mean of its divisors is an integer number (99792).

2^2156756 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 2156756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2395008).

2156756 is an abundant number, since it is smaller than the sum of its proper divisors (2633260).

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

2156756 is a wasteful number, since it uses less digits than its factorization.

2156756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 246 counting only the distinct ones).

The product of its digits is 12600, while the sum is 32.

The square root of 2156756 is about 1468.5897997739. The cubic root of 2156756 is about 129.2013361439.

The spelling of 2156756 in words is "two million, one hundred fifty-six thousand, seven hundred fifty-six".