320400043 has 2 divisors, whose sum is σ = 320400044. Its totient is φ = 320400042.

The previous prime is 320400019. The next prime is 320400049. The reversal of 320400043 is 340004023.

It is a strong prime.

It is an emirp because it is prime and its reverse (340004023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320400043 - 2⁵ = 320400011 is a prime.

It is not a weakly prime, because it can be changed into another prime (320400049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160200021 + 160200022.

It is an arithmetic number, because the mean of its divisors is an integer number (160200022).

Almost surely, 2^320400043 is an apocalyptic number.

320400043 is a deficient number, since it is larger than the sum of its proper divisors (1).

320400043 is an equidigital number, since it uses as much as digits as its factorization.

320400043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 320400043 is about 17899.7218693476. The cubic root of 320400043 is about 684.2752866074.

Adding to 320400043 its reverse (340004023), we get a palindrome (660404066).

The spelling of 320400043 in words is "three hundred twenty million, four hundred thousand, forty-three".