40004440391 has 2 divisors, whose sum is σ = 40004440392. Its totient is φ = 40004440390.

The previous prime is 40004440381. The next prime is 40004440447. The reversal of 40004440391 is 19304440004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40004440391 - 2¹⁴ = 40004424007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40004440381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20002220195 + 20002220196.

It is an arithmetic number, because the mean of its divisors is an integer number (20002220196).

Almost surely, 2^40004440391 is an apocalyptic number.

40004440391 is a deficient number, since it is larger than the sum of its proper divisors (1).

40004440391 is an equidigital number, since it uses as much as digits as its factorization.

40004440391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 40004440391 its reverse (19304440004), we get a palindrome (59308880395).

The spelling of 40004440391 in words is "forty billion, four million, four hundred forty thousand, three hundred ninety-one".