400006811 has 2 divisors, whose sum is σ = 400006812. Its totient is φ = 400006810.

The previous prime is 400006807. The next prime is 400006813. The reversal of 400006811 is 118600004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400006811 - 2² = 400006807 is a prime.

Together with 400006813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400006813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200003405 + 200003406.

It is an arithmetic number, because the mean of its divisors is an integer number (200003406).

Almost surely, 2^400006811 is an apocalyptic number.

400006811 is a deficient number, since it is larger than the sum of its proper divisors (1).

400006811 is an equidigital number, since it uses as much as digits as its factorization.

400006811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 400006811 is about 20000.1702742752. The cubic root of 400006811 is about 736.8104816941.

Adding to 400006811 its reverse (118600004), we get a palindrome (518606815).

The spelling of 400006811 in words is "four hundred million, six thousand, eight hundred eleven".