400204111 has 2 divisors, whose sum is σ = 400204112. Its totient is φ = 400204110.

The previous prime is 400204109. The next prime is 400204127. The reversal of 400204111 is 111402004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400204111 - 2¹ = 400204109 is a prime.

It is a super-2 number, since 2×400204111² = 320326660922600642, which contains 22 as substring.

Together with 400204109, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 400204091 and 400204100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400204411) 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, 200102055 + 200102056.

It is an arithmetic number, because the mean of its divisors is an integer number (200102056).

Almost surely, 2^400204111 is an apocalyptic number.

400204111 is a deficient number, since it is larger than the sum of its proper divisors (1).

400204111 is an equidigital number, since it uses as much as digits as its factorization.

400204111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 400204111 is about 20005.1021242082. The cubic root of 400204111 is about 736.9316036428.

Adding to 400204111 its reverse (111402004), we get a palindrome (511606115).

The spelling of 400204111 in words is "four hundred million, two hundred four thousand, one hundred eleven".