400006843 has 4 divisors (see below), whose sum is σ = 406786680. Its totient is φ = 393227008.

The previous prime is 400006819. The next prime is 400006853. The reversal of 400006843 is 348600004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400006843 - 2⁵ = 400006811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400006813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3389830 + ... + 3389947.

It is an arithmetic number, because the mean of its divisors is an integer number (101696670).

Almost surely, 2^400006843 is an apocalyptic number.

400006843 is a deficient number, since it is larger than the sum of its proper divisors (6779837).

400006843 is an equidigital number, since it uses as much as digits as its factorization.

400006843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6779836.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 400006843 is about 20000.1710742683. The cubic root of 400006843 is about 736.8105013420.

Adding to 400006843 its reverse (348600004), we get a palindrome (748606847).

The spelling of 400006843 in words is "four hundred million, six thousand, eight hundred forty-three".