40004444393 has 2 divisors, whose sum is σ = 40004444394. Its totient is φ = 40004444392.

The previous prime is 40004444327. The next prime is 40004444401. The reversal of 40004444393 is 39344440004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29836343824 + 10168100569 = 172732^2 + 100837^2 .

It is a cyclic number.

It is not a de Polignac number, because 40004444393 - 2¹⁶ = 40004378857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40004444323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20002222196 + 20002222197.

It is an arithmetic number, because the mean of its divisors is an integer number (20002222197).

Almost surely, 2^40004444393 is an apocalyptic number.

It is an amenable number.

40004444393 is a deficient number, since it is larger than the sum of its proper divisors (1).

40004444393 is an equidigital number, since it uses as much as digits as its factorization.

40004444393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 35.

Adding to 40004444393 its reverse (39344440004), we get a palindrome (79348884397).

The spelling of 40004444393 in words is "forty billion, four million, four hundred forty-four thousand, three hundred ninety-three".