4128729 has 8 divisors (see below), whose sum is σ = 6005472. Its totient is φ = 2502240.

The previous prime is 4128713. The next prime is 4128743. The reversal of 4128729 is 9278214.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4128729 - 2⁴ = 4128713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 125113 = 4128729 / (4 + 1 + 2 + 8 + 7 + 2 + 9).

4128729 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4128729.

It is not an unprimeable number, because it can be changed into a prime (4128749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62524 + ... + 62589.

It is an arithmetic number, because the mean of its divisors is an integer number (750684).

Almost surely, 2^4128729 is an apocalyptic number.

It is an amenable number.

4128729 is a deficient number, since it is larger than the sum of its proper divisors (1876743).

4128729 is a wasteful number, since it uses less digits than its factorization.

4128729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125127.

The product of its digits is 8064, while the sum is 33.

The square root of 4128729 is about 2031.9274101207. The cubic root of 4128729 is about 160.4250287952.

The spelling of 4128729 in words is "four million, one hundred twenty-eight thousand, seven hundred twenty-nine".