4385729 has 6 divisors (see below), whose sum is σ = 4497030. Its totient is φ = 4277120.

The previous prime is 4385701. The next prime is 4385743. The reversal of 4385729 is 9275834.

It can be written as a sum of positive squares in 3 ways, for example, as 142129 + 4243600 = 377^2 + 2060^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4385729 is a prime.

It is a super-2 number, since 2×4385729² = 38469237722882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4385692 and 4385701.

It is not an unprimeable number, because it can be changed into a prime (4385629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 377 + ... + 2985.

It is an arithmetic number, because the mean of its divisors is an integer number (749505).

Almost surely, 2^4385729 is an apocalyptic number.

It is an amenable number.

4385729 is a deficient number, since it is larger than the sum of its proper divisors (111301).

4385729 is an equidigital number, since it uses as much as digits as its factorization.

4385729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691 (or 2650 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 4385729 is about 2094.2132174160. The cubic root of 4385729 is about 163.6869026367.

The spelling of 4385729 in words is "four million, three hundred eighty-five thousand, seven hundred twenty-nine".