400943 has 2 divisors, whose sum is σ = 400944. Its totient is φ = 400942.

The previous prime is 400931. The next prime is 400949. The reversal of 400943 is 349004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400943 - 2⁴ = 400927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200471 + 200472.

It is an arithmetic number, because the mean of its divisors is an integer number (200472).

2⁴⁰⁰⁹⁴³ is an apocalyptic number.

400943 is a deficient number, since it is larger than the sum of its proper divisors (1).

400943 is an equidigital number, since it uses as much as digits as its factorization.

400943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 400943 is about 633.2006001261. The cubic root of 400943 is about 73.7384852271.

Adding to 400943 its reverse (349004), we get a palindrome (749947).

The spelling of 400943 in words is "four hundred thousand, nine hundred forty-three".