4028729 has 4 divisors (see below), whose sum is σ = 4158720. Its totient is φ = 3898740.

The previous prime is 4028723. The next prime is 4028743. The reversal of 4028729 is 9278204.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4028729 is a prime.

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 = 4028695 and 4028704.

It is not an unprimeable number, because it can be changed into a prime (4028723) 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, 64949 + ... + 65010.

It is an arithmetic number, because the mean of its divisors is an integer number (1039680).

Almost surely, 2^4028729 is an apocalyptic number.

It is an amenable number.

4028729 is a deficient number, since it is larger than the sum of its proper divisors (129991).

4028729 is a wasteful number, since it uses less digits than its factorization.

4028729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129990.

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

The square root of 4028729 is about 2007.1693999262. The cubic root of 4028729 is about 159.1192360098.

The spelling of 4028729 in words is "four million, twenty-eight thousand, seven hundred twenty-nine".