2172928 has 24 divisors (see below), whose sum is σ = 4348890. Its totient is φ = 1085440.

The previous prime is 2172917. The next prime is 2172943. The reversal of 2172928 is 8292712.

It can be written as a sum of positive squares in only one way, i.e., 1721344 + 451584 = 1312^2 + 672^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2172928.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1518 + ... + 2578.

2^2172928 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 2172928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2174445).

2172928 is an abundant number, since it is smaller than the sum of its proper divisors (2175962).

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

2172928 is an equidigital number, since it uses as much as digits as its factorization.

2172928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083 (or 1063 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 2172928 is about 1474.0854792040. The cubic root of 2172928 is about 129.5234624036.

The spelling of 2172928 in words is "two million, one hundred seventy-two thousand, nine hundred twenty-eight".