2179728 has 30 divisors (see below), whose sum is σ = 6100614. Its totient is φ = 726528.

The previous prime is 2179693. The next prime is 2179729. The reversal of 2179728 is 8279712.

It can be written as a sum of positive squares in only one way, i.e., 1937664 + 242064 = 1392^2 + 492^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2179692 and 2179701.

It is not an unprimeable number, because it can be changed into a prime (2179729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7425 + ... + 7712.

2^2179728 is an apocalyptic number.

It is an amenable number.

2179728 is an abundant number, since it is smaller than the sum of its proper divisors (3920886).

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

2179728 is a wasteful number, since it uses less digits than its factorization.

2179728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15151 (or 15142 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 2179728 is about 1476.3901923272. The cubic root of 2179728 is about 129.6584327268.

The spelling of 2179728 in words is "two million, one hundred seventy-nine thousand, seven hundred twenty-eight".