400111 has 4 divisors (see below), whose sum is σ = 408672. Its totient is φ = 391552.

The previous prime is 400109. The next prime is 400123. The reversal of 400111 is 111004.

It is a happy number.

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 400111 - 2¹ = 400109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400094 and 400103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4210 + ... + 4303.

It is an arithmetic number, because the mean of its divisors is an integer number (102168).

2⁴⁰⁰¹¹¹ is an apocalyptic number.

400111 is a deficient number, since it is larger than the sum of its proper divisors (8561).

400111 is an equidigital number, since it uses as much as digits as its factorization.

400111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8560.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 400111 is about 632.5432791517. The cubic root of 400111 is about 73.6874448007.

Adding to 400111 its reverse (111004), we get a palindrome (511115).

The spelling of 400111 in words is "four hundred thousand, one hundred eleven", and thus it is an iban number.