4128709 has 4 divisors (see below), whose sum is σ = 4446316. Its totient is φ = 3811104.

The previous prime is 4128697. The next prime is 4128713. The reversal of 4128709 is 9078214.

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 1416100 + 2712609 = 1190^2 + 1647^2 .

It is a cyclic number.

It is not a de Polignac number, because 4128709 - 2⁷ = 4128581 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158784 + ... + 158809.

It is an arithmetic number, because the mean of its divisors is an integer number (1111579).

Almost surely, 2^4128709 is an apocalyptic number.

It is an amenable number.

4128709 is a deficient number, since it is larger than the sum of its proper divisors (317607).

4128709 is a wasteful number, since it uses less digits than its factorization.

4128709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317606.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 4128709 is about 2031.9224886791. The cubic root of 4128709 is about 160.4247697562.

The spelling of 4128709 in words is "four million, one hundred twenty-eight thousand, seven hundred nine".