4540409 has 4 divisors (see below), whose sum is σ = 4547940. Its totient is φ = 4532880.

The previous prime is 4540397. The next prime is 4540423. The reversal of 4540409 is 9040454.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9040454 = 2 ⋅4520227.

It can be written as a sum of positive squares in 2 ways, for example, as 1488400 + 3052009 = 1220^2 + 1747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4540409 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4540429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2774 + ... + 4095.

It is an arithmetic number, because the mean of its divisors is an integer number (1136985).

Almost surely, 2^4540409 is an apocalyptic number.

It is an amenable number.

4540409 is a deficient number, since it is larger than the sum of its proper divisors (7531).

4540409 is an equidigital number, since it uses as much as digits as its factorization.

4540409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7530.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 4540409 is about 2130.8235497103. The cubic root of 4540409 is about 165.5890667982.

The spelling of 4540409 in words is "four million, five hundred forty thousand, four hundred nine".