40004044397 has 2 divisors, whose sum is σ = 40004044398. Its totient is φ = 40004044396.

The previous prime is 40004044391. The next prime is 40004044429. The reversal of 40004044397 is 79344040004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35483633641 + 4520410756 = 188371^2 + 67234^2 .

It is a cyclic number.

It is not a de Polignac number, because 40004044397 - 2¹⁴ = 40004028013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40004044391) 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, 20002022198 + 20002022199.

It is an arithmetic number, because the mean of its divisors is an integer number (20002022199).

Almost surely, 2^40004044397 is an apocalyptic number.

It is an amenable number.

40004044397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40004044397 is an equidigital number, since it uses as much as digits as its factorization.

40004044397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 35.

The spelling of 40004044397 in words is "forty billion, four million, forty-four thousand, three hundred ninety-seven".