273409 has 4 divisors (see below), whose sum is σ = 274516. Its totient is φ = 272304.

The previous prime is 273367. The next prime is 273433. The reversal of 273409 is 904372.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 222784 + 50625 = 472^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 273409 - 2⁷ = 273281 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 (273709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7 + ... + 739.

It is an arithmetic number, because the mean of its divisors is an integer number (68629).

It is a Proth number, since it is equal to 267 ⋅ 2¹⁰ + 1 and 267 < 2¹⁰.

2²⁷³⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

273409 is a deficient number, since it is larger than the sum of its proper divisors (1107).

273409 is an equidigital number, since it uses as much as digits as its factorization.

273409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 273409 is about 522.8852646614. The cubic root of 273409 is about 64.9039211688.

The spelling of 273409 in words is "two hundred seventy-three thousand, four hundred nine".