400400443 has 2 divisors, whose sum is σ = 400400444. Its totient is φ = 400400442.

The previous prime is 400400437. The next prime is 400400467. The reversal of 400400443 is 344004004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400400443 - 2²¹ = 398303291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400400443.

It is not a weakly prime, because it can be changed into another prime (400406443) 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, 200200221 + 200200222.

It is an arithmetic number, because the mean of its divisors is an integer number (200200222).

Almost surely, 2^400400443 is an apocalyptic number.

400400443 is a deficient number, since it is larger than the sum of its proper divisors (1).

400400443 is an equidigital number, since it uses as much as digits as its factorization.

400400443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 400400443 is about 20010.0085707128. The cubic root of 400400443 is about 737.0520918291.

Adding to 400400443 its reverse (344004004), we get a palindrome (744404447).

The spelling of 400400443 in words is "four hundred million, four hundred thousand, four hundred forty-three".