676409 has 2 divisors, whose sum is σ = 676410. Its totient is φ = 676408.

The previous prime is 676391. The next prime is 676411. The reversal of 676409 is 904676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 426409 + 250000 = 653^2 + 500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-676409 is a prime.

Together with 676411, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (676469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338204 + 338205.

It is an arithmetic number, because the mean of its divisors is an integer number (338205).

2⁶⁷⁶⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

676409 is a deficient number, since it is larger than the sum of its proper divisors (1).

676409 is an equidigital number, since it uses as much as digits as its factorization.

676409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 676409 is about 822.4408793342. The cubic root of 676409 is about 87.7815258893.

The spelling of 676409 in words is "six hundred seventy-six thousand, four hundred nine".