1040020439 has 2 divisors, whose sum is σ = 1040020440. Its totient is φ = 1040020438.

The previous prime is 1040020433. The next prime is 1040020453. The reversal of 1040020439 is 9340200401.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1040020439 - 2¹² = 1040016343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1040020433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520010219 + 520010220.

It is an arithmetic number, because the mean of its divisors is an integer number (520010220).

Almost surely, 2^1040020439 is an apocalyptic number.

1040020439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1040020439 is an equidigital number, since it uses as much as digits as its factorization.

1040020439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1040020439 is about 32249.3478848798. The cubic root of 1040020439 is about 1013.1660409450.

The spelling of 1040020439 in words is "one billion, forty million, twenty thousand, four hundred thirty-nine".