2173728 has 24 divisors (see below), whose sum is σ = 5706288. Its totient is φ = 724544.

The previous prime is 2173727. The next prime is 2173729. The reversal of 2173728 is 8273712.

It is an interprime number because it is at equal distance from previous prime (2173727) and next prime (2173729).

It is a tau number, because it is divible by the number of its divisors (24).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2173695 and 2173704.

It is not an unprimeable number, because it can be changed into a prime (2173727) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11226 + ... + 11417.

It is an arithmetic number, because the mean of its divisors is an integer number (237762).

2^2173728 is an apocalyptic number.

It is an amenable number.

2173728 is an abundant number, since it is smaller than the sum of its proper divisors (3532560).

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

2173728 is a wasteful number, since it uses less digits than its factorization.

2173728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22656 (or 22648 counting only the distinct ones).

The product of its digits is 4704, while the sum is 30.

The square root of 2173728 is about 1474.3568089170. The cubic root of 2173728 is about 129.5393558672.

The spelling of 2173728 in words is "two million, one hundred seventy-three thousand, seven hundred twenty-eight".