4728209 has 4 divisors (see below), whose sum is σ = 4738560. Its totient is φ = 4717860.

The previous prime is 4728203. The next prime is 4728211. The reversal of 4728209 is 9028274.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9028274 = 2 ⋅4514137.

It is a cyclic number.

It is not a de Polignac number, because 4728209 - 2⁸ = 4727953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4728203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4457 + ... + 5414.

It is an arithmetic number, because the mean of its divisors is an integer number (1184640).

Almost surely, 2^4728209 is an apocalyptic number.

It is an amenable number.

4728209 is a deficient number, since it is larger than the sum of its proper divisors (10351).

4728209 is an equidigital number, since it uses as much as digits as its factorization.

4728209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10350.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 4728209 is about 2174.4445267700. Note that the first 3 decimals coincide. The cubic root of 4728209 is about 167.8413207877.

The spelling of 4728209 in words is "four million, seven hundred twenty-eight thousand, two hundred nine".