1001440939 has 2 divisors, whose sum is σ = 1001440940. Its totient is φ = 1001440938.

The previous prime is 1001440933. The next prime is 1001440969. The reversal of 1001440939 is 9390441001.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001440939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001440939.

It is not a weakly prime, because it can be changed into another prime (1001440933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500720469 + 500720470.

It is an arithmetic number, because the mean of its divisors is an integer number (500720470).

Almost surely, 2^1001440939 is an apocalyptic number.

1001440939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001440939 is an equidigital number, since it uses as much as digits as its factorization.

1001440939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1001440939 is about 31645.5516463215. The cubic root of 1001440939 is about 1000.4800824839.

The spelling of 1001440939 in words is "one billion, one million, four hundred forty thousand, nine hundred thirty-nine".