400243111 has 4 divisors (see below), whose sum is σ = 400416424. Its totient is φ = 400069800.

The previous prime is 400243099. The next prime is 400243147. The reversal of 400243111 is 111342004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400243111 - 2⁹ = 400242599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400213111) 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 in 3 ways as a sum of consecutive naturals, for example, 83145 + ... + 87826.

It is an arithmetic number, because the mean of its divisors is an integer number (100104106).

Almost surely, 2^400243111 is an apocalyptic number.

400243111 is a deficient number, since it is larger than the sum of its proper divisors (173313).

400243111 is a wasteful number, since it uses less digits than its factorization.

400243111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173312.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 400243111 is about 20006.0768517968. The cubic root of 400243111 is about 736.9555409273.

Adding to 400243111 its reverse (111342004), we get a palindrome (511585115).

The spelling of 400243111 in words is "four hundred million, two hundred forty-three thousand, one hundred eleven".