1009439 has 2 divisors, whose sum is σ = 1009440. Its totient is φ = 1009438.

The previous prime is 1009433. The next prime is 1009457. The reversal of 1009439 is 9349001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1009439 - 2¹⁶ = 943903 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1009433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504719 + 504720.

It is an arithmetic number, because the mean of its divisors is an integer number (504720).

2^1009439 is an apocalyptic number.

1009439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009439 is an equidigital number, since it uses as much as digits as its factorization.

1009439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1009439 is about 1004.7084154122. The cubic root of 1009439 is about 100.3136485507.

The spelling of 1009439 in words is "one million, nine thousand, four hundred thirty-nine".