405239 has 2 divisors, whose sum is σ = 405240. Its totient is φ = 405238.

The previous prime is 405227. The next prime is 405241. The reversal of 405239 is 932504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 405239 - 2⁸ = 404983 is a prime.

Together with 405241, 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 (405269) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202619 + 202620.

It is an arithmetic number, because the mean of its divisors is an integer number (202620).

2⁴⁰⁵²³⁹ is an apocalyptic number.

405239 is a deficient number, since it is larger than the sum of its proper divisors (1).

405239 is an equidigital number, since it uses as much as digits as its factorization.

405239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 405239 is about 636.5838515074. The cubic root of 405239 is about 74.0009130640. Note that the first 3 decimals are identical.

The spelling of 405239 in words is "four hundred five thousand, two hundred thirty-nine".