400256011 has 2 divisors, whose sum is σ = 400256012. Its totient is φ = 400256010.

The previous prime is 400256009. The next prime is 400256027. The reversal of 400256011 is 110652004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400256011 - 2¹ = 400256009 is a prime.

Together with 400256009, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 400256011.

It is not a weakly prime, because it can be changed into another prime (400256911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200128005 + 200128006.

It is an arithmetic number, because the mean of its divisors is an integer number (200128006).

Almost surely, 2^400256011 is an apocalyptic number.

400256011 is a deficient number, since it is larger than the sum of its proper divisors (1).

400256011 is an equidigital number, since it uses as much as digits as its factorization.

400256011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 400256011 is about 20006.3992512396. The cubic root of 400256011 is about 736.9634583022.

The spelling of 400256011 in words is "four hundred million, two hundred fifty-six thousand, eleven".