400400408311 has 2 divisors, whose sum is σ = 400400408312. Its totient is φ = 400400408310.

The previous prime is 400400408251. The next prime is 400400408323. The reversal of 400400408311 is 113804004004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400400408311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400400408351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200200204155 + 200200204156.

It is an arithmetic number, because the mean of its divisors is an integer number (200200204156).

Almost surely, 2^400400408311 is an apocalyptic number.

400400408311 is a deficient number, since it is larger than the sum of its proper divisors (1).

400400408311 is an equidigital number, since it uses as much as digits as its factorization.

400400408311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 25.

The spelling of 400400408311 in words is "four hundred billion, four hundred million, four hundred eight thousand, three hundred eleven".