1040443509 has 32 divisors (see below), whose sum is σ = 1638400000. Its totient is φ = 586967472.

The previous prime is 1040443501. The next prime is 1040443519. The reversal of 1040443509 is 9053440401.

It is not a de Polignac number, because 1040443509 - 2³ = 1040443501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040443501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74892 + ... + 87690.

It is an arithmetic number, because the mean of its divisors is an integer number (51200000).

Almost surely, 2^1040443509 is an apocalyptic number.

It is an amenable number.

1040443509 is a deficient number, since it is larger than the sum of its proper divisors (597956491).

1040443509 is an equidigital number, since it uses as much as digits as its factorization.

1040443509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12902 (or 12888 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1040443509 is about 32255.9065753855. The cubic root of 1040443509 is about 1013.3034042864.

The spelling of 1040443509 in words is "one billion, forty million, four hundred forty-three thousand, five hundred nine".