1005640439 has 2 divisors, whose sum is σ = 1005640440. Its totient is φ = 1005640438.

The previous prime is 1005640409. The next prime is 1005640487. The reversal of 1005640439 is 9340465001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1005640439 - 2¹⁶ = 1005574903 is a prime.

It is a super-2 number, since 2×1005640439² = 2022625385104225442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1005640409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502820219 + 502820220.

It is an arithmetic number, because the mean of its divisors is an integer number (502820220).

Almost surely, 2^1005640439 is an apocalyptic number.

1005640439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005640439 is an equidigital number, since it uses as much as digits as its factorization.

1005640439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1005640439 is about 31711.8343682607. The cubic root of 1005640439 is about 1001.8766224187.

The spelling of 1005640439 in words is "one billion, five million, six hundred forty thousand, four hundred thirty-nine".