2169728 has 64 divisors (see below), whose sum is σ = 4993920. Its totient is φ = 929280.

The previous prime is 2169707. The next prime is 2169749. The reversal of 2169728 is 8279612.

It is a happy number.

2169728 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 1473²-1.

It is an interprime number because it is at equal distance from previous prime (2169707) and next prime (2169749).

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32351 + ... + 32417.

It is an arithmetic number, because the mean of its divisors is an integer number (78030).

2^2169728 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 2169728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2496960).

2169728 is an abundant number, since it is smaller than the sum of its proper divisors (2824192).

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

2169728 is a wasteful number, since it uses less digits than its factorization.

2169728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 103 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 2169728 is about 1472.9996605566. Note that the first 3 decimals coincide. The cubic root of 2169728 is about 129.4598495109.

The spelling of 2169728 in words is "two million, one hundred sixty-nine thousand, seven hundred twenty-eight".