400401311 has 2 divisors, whose sum is σ = 400401312. Its totient is φ = 400401310.

The previous prime is 400401283. The next prime is 400401329. The reversal of 400401311 is 113104004.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400401311 - 2⁶ = 400401247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400401361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200200655 + 200200656.

It is an arithmetic number, because the mean of its divisors is an integer number (200200656).

Almost surely, 2^400401311 is an apocalyptic number.

400401311 is a deficient number, since it is larger than the sum of its proper divisors (1).

400401311 is an equidigital number, since it uses as much as digits as its factorization.

400401311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 400401311 is about 20010.0302598472. The cubic root of 400401311 is about 737.0526244299.

Adding to 400401311 its reverse (113104004), we get a palindrome (513505315).

The spelling of 400401311 in words is "four hundred million, four hundred one thousand, three hundred eleven".