400666043 has 2 divisors, whose sum is σ = 400666044. Its totient is φ = 400666042.

The previous prime is 400666039. The next prime is 400666051. The reversal of 400666043 is 340666004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400666043 - 2² = 400666039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400665997 and 400666015.

It is not a weakly prime, because it can be changed into another prime (400666033) 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, 200333021 + 200333022.

It is an arithmetic number, because the mean of its divisors is an integer number (200333022).

Almost surely, 2^400666043 is an apocalyptic number.

400666043 is a deficient number, since it is larger than the sum of its proper divisors (1).

400666043 is an equidigital number, since it uses as much as digits as its factorization.

400666043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 400666043 is about 20016.6441493073. The cubic root of 400666043 is about 737.2150268523.

The spelling of 400666043 in words is "four hundred million, six hundred sixty-six thousand, forty-three".