7409 has 4 divisors (see below), whose sum is σ = 7680. Its totient is φ = 7140.

The previous prime is 7393. The next prime is 7411. The reversal of 7409 is 9047.

7409 is nontrivially palindromic in base 6 and base 8.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9047 = 83 ⋅109.

It is a cyclic number.

It is not a de Polignac number, because 7409 - 2⁴ = 7393 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13 and base 15.

It is not an unprimeable number, because it can be changed into a prime (7459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89 + ... + 150.

It is an arithmetic number, because the mean of its divisors is an integer number (1920).

2⁷⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

7409 is a deficient number, since it is larger than the sum of its proper divisors (271).

7409 is a wasteful number, since it uses less digits than its factorization.

7409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 7409 is about 86.0755482120. The cubic root of 7409 is about 19.4948485187.

The spelling of 7409 in words is "seven thousand, four hundred nine".