276409 has 6 divisors (see below), whose sum is σ = 321594. Its totient is φ = 236880.

The previous prime is 276401. The next prime is 276439. The reversal of 276409 is 904672.

It can be written as a sum of positive squares in only one way, i.e., 275625 + 784 = 525^2 + 28^2 .

It is not a de Polignac number, because 276409 - 2³ = 276401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (276401) 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 5 ways as a sum of consecutive naturals, for example, 2772 + ... + 2869.

It is an arithmetic number, because the mean of its divisors is an integer number (53599).

2²⁷⁶⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

276409 is a deficient number, since it is larger than the sum of its proper divisors (45185).

276409 is an equidigital number, since it uses as much as digits as its factorization.

276409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5655 (or 5648 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 276409 is about 525.7461364575. The cubic root of 276409 is about 65.1404458263.

The spelling of 276409 in words is "two hundred seventy-six thousand, four hundred nine".