400211111 has 2 divisors, whose sum is σ = 400211112. Its totient is φ = 400211110.

The previous prime is 400211099. The next prime is 400211171. The reversal of 400211111 is 111112004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400211111 - 2¹⁰ = 400210087 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

400211111 is a modest number, since divided by 11111 gives 4002 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 400211092 and 400211101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400211171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200105555 + 200105556.

It is an arithmetic number, because the mean of its divisors is an integer number (200105556).

Almost surely, 2^400211111 is an apocalyptic number.

400211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

400211111 is an equidigital number, since it uses as much as digits as its factorization.

400211111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 400211111 is about 20005.2770788110. The cubic root of 400211111 is about 736.9359001930.

Adding to 400211111 its reverse (111112004), we get a palindrome (511323115).

The spelling of 400211111 in words is "four hundred million, two hundred eleven thousand, one hundred eleven".