4320409 has 4 divisors (see below), whose sum is σ = 4336740. Its totient is φ = 4304080.

The previous prime is 4320383. The next prime is 4320419. The reversal of 4320409 is 9040234.

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 138384 + 4182025 = 372^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 4320409 - 2¹⁷ = 4189337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4320409.

It is not an unprimeable number, because it can be changed into a prime (4320419) 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, 7762 + ... + 8299.

It is an arithmetic number, because the mean of its divisors is an integer number (1084185).

Almost surely, 2^4320409 is an apocalyptic number.

It is an amenable number.

4320409 is a deficient number, since it is larger than the sum of its proper divisors (16331).

4320409 is a wasteful number, since it uses less digits than its factorization.

4320409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16330.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 4320409 is about 2078.5593568623. The cubic root of 4320409 is about 162.8701966335.

The spelling of 4320409 in words is "four million, three hundred twenty thousand, four hundred nine".