1005439 has 2 divisors, whose sum is σ = 1005440. Its totient is φ = 1005438.

The previous prime is 1005437. The next prime is 1005457. The reversal of 1005439 is 9345001.

It is a weak prime.

It is an emirp because it is prime and its reverse (9345001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1005439 - 2¹ = 1005437 is a prime.

Together with 1005437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1005437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502719 + 502720.

It is an arithmetic number, because the mean of its divisors is an integer number (502720).

2^1005439 is an apocalyptic number.

1005439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005439 is an equidigital number, since it uses as much as digits as its factorization.

1005439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1005439 is about 1002.7158121821. The cubic root of 1005439 is about 100.1809722927.

It can be divided in two parts, 1005 and 439, that added together give a square (1444 = 38²).

The spelling of 1005439 in words is "one million, five thousand, four hundred thirty-nine".