40842816397 has 2 divisors, whose sum is σ = 40842816398. Its totient is φ = 40842816396.

The previous prime is 40842816383. The next prime is 40842816401. The reversal of 40842816397 is 79361824804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37678303881 + 3164512516 = 194109^2 + 56254^2 .

It is a cyclic number.

It is not a de Polignac number, because 40842816397 - 2⁷ = 40842816269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40842813397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20421408198 + 20421408199.

It is an arithmetic number, because the mean of its divisors is an integer number (20421408199).

Almost surely, 2^40842816397 is an apocalyptic number.

It is an amenable number.

40842816397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40842816397 is an equidigital number, since it uses as much as digits as its factorization.

40842816397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 40842816397 in words is "forty billion, eight hundred forty-two million, eight hundred sixteen thousand, three hundred ninety-seven".