4128409 has 2 divisors, whose sum is σ = 4128410. Its totient is φ = 4128408.

The previous prime is 4128401. The next prime is 4128427. The reversal of 4128409 is 9048214.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4112784 + 15625 = 2028^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 4128409 - 2³ = 4128401 is a prime.

It is not a weakly prime, because it can be changed into another prime (4128401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2064204 + 2064205.

It is an arithmetic number, because the mean of its divisors is an integer number (2064205).

Almost surely, 2^4128409 is an apocalyptic number.

It is an amenable number.

4128409 is a deficient number, since it is larger than the sum of its proper divisors (1).

4128409 is an equidigital number, since it uses as much as digits as its factorization.

4128409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 4128409 is about 2031.8486656245. The cubic root of 4128409 is about 160.4208840705.

The spelling of 4128409 in words is "four million, one hundred twenty-eight thousand, four hundred nine".