4228729 has 4 divisors (see below), whose sum is σ = 4234660. Its totient is φ = 4222800.

The previous prime is 4228727. The next prime is 4228739. The reversal of 4228729 is 9278224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 769129 + 3459600 = 877^2 + 1860^2 .

It is a cyclic number.

It is not a de Polignac number, because 4228729 - 2¹ = 4228727 is a prime.

It is a Duffinian number.

4228729 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4228694 and 4228703.

It is not an unprimeable number, because it can be changed into a prime (4228723) 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, 1722 + ... + 3379.

It is an arithmetic number, because the mean of its divisors is an integer number (1058665).

Almost surely, 2^4228729 is an apocalyptic number.

It is an amenable number.

4228729 is a deficient number, since it is larger than the sum of its proper divisors (5931).

4228729 is an equidigital number, since it uses as much as digits as its factorization.

4228729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5930.

The product of its digits is 16128, while the sum is 34.

The square root of 4228729 is about 2056.3873662323. The cubic root of 4228729 is about 161.7099035286.

The spelling of 4228729 in words is "four million, two hundred twenty-eight thousand, seven hundred twenty-nine".