4003409 has 4 divisors (see below), whose sum is σ = 4014516. Its totient is φ = 3992304.

The previous prime is 4003397. The next prime is 4003423. The reversal of 4003409 is 9043004.

4003409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1123600 + 2879809 = 1060^2 + 1697^2 .

It is a cyclic number.

It is not a de Polignac number, because 4003409 - 2¹² = 3999313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4003459) 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 3 ways as a sum of consecutive naturals, for example, 4994 + ... + 5739.

It is an arithmetic number, because the mean of its divisors is an integer number (1003629).

Almost surely, 2^4003409 is an apocalyptic number.

It is an amenable number.

4003409 is a deficient number, since it is larger than the sum of its proper divisors (11107).

4003409 is a wasteful number, since it uses less digits than its factorization.

4003409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11106.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 4003409 is about 2000.8520684948. The cubic root of 4003409 is about 158.7851878102.

The spelling of 4003409 in words is "four million, three thousand, four hundred nine".