400343343319393 has 2 divisors, whose sum is σ = 400343343319394. Its totient is φ = 400343343319392.

The previous prime is 400343343319391. The next prime is 400343343319397. The reversal of 400343343319393 is 393913343343004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382480277752609 + 17863065566784 = 19557103^2 + 4226472^2 .

It is a cyclic number.

It is not a de Polignac number, because 400343343319393 - 2¹ = 400343343319391 is a prime.

Together with 400343343319391, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 400343343319393.

It is not a weakly prime, because it can be changed into another prime (400343343319391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200171671659696 + 200171671659697.

It is an arithmetic number, because the mean of its divisors is an integer number (200171671659697).

Almost surely, 2^{400343343319393} is an apocalyptic number.

It is an amenable number.

400343343319393 is a deficient number, since it is larger than the sum of its proper divisors (1).

400343343319393 is an equidigital number, since it uses as much as digits as its factorization.

400343343319393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11337408, while the sum is 52.

The spelling of 400343343319393 in words is "four hundred trillion, three hundred forty-three billion, three hundred forty-three million, three hundred nineteen thousand, three hundred ninety-three".