2156544 has 120 divisors (see below), whose sum is σ = 6936930. Its totient is φ = 663552.

The previous prime is 2156537. The next prime is 2156597. The reversal of 2156544 is 4456512.

2156544 is a `hidden beast` number, since 2 + 1 + 5 + 654 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2073600 + 82944 = 1440^2 + 288^2 .

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

It is a nialpdrome in base 12.

It is a zygodrome in base 12.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 165882 + ... + 165894.

2^2156544 is an apocalyptic number.

2156544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3468465).

2156544 is an abundant number, since it is smaller than the sum of its proper divisors (4780386).

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

2156544 is an equidigital number, since it uses as much as digits as its factorization.

2156544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47 (or 18 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 2156544 is about 1468.5176199147. The cubic root of 2156544 is about 129.1971026901.

Subtracting 2156544 from its reverse (4456512), we obtain a cube (2299968 = 132³).

It can be divided in two parts, 21565 and 44, that added together give a square (21609 = 147²).

The spelling of 2156544 in words is "two million, one hundred fifty-six thousand, five hundred forty-four".