400344453643 has 2 divisors, whose sum is σ = 400344453644. Its totient is φ = 400344453642.

The previous prime is 400344453617. The next prime is 400344453671. The reversal of 400344453643 is 346354443004.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400344453643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400344453596 and 400344453605.

It is not a weakly prime, because it can be changed into another prime (400344453043) 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, 200172226821 + 200172226822.

It is an arithmetic number, because the mean of its divisors is an integer number (200172226822).

Almost surely, 2^400344453643 is an apocalyptic number.

400344453643 is a deficient number, since it is larger than the sum of its proper divisors (1).

400344453643 is an equidigital number, since it uses as much as digits as its factorization.

400344453643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 40.

Adding to 400344453643 its reverse (346354443004), we get a palindrome (746698896647).

The spelling of 400344453643 in words is "four hundred billion, three hundred forty-four million, four hundred fifty-three thousand, six hundred forty-three".