400520111 has 4 divisors (see below), whose sum is σ = 401449824. Its totient is φ = 399590400.

The previous prime is 400520077. The next prime is 400520167. The reversal of 400520111 is 111025004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400520111 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 (400520011) 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, 464210 + ... + 465071.

It is an arithmetic number, because the mean of its divisors is an integer number (100362456).

Almost surely, 2^400520111 is an apocalyptic number.

400520111 is a deficient number, since it is larger than the sum of its proper divisors (929713).

400520111 is an equidigital number, since it uses as much as digits as its factorization.

400520111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929712.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 400520111 is about 20012.9985509418. The cubic root of 400520111 is about 737.1255122975.

Adding to 400520111 its reverse (111025004), we get a palindrome (511545115).

The spelling of 400520111 in words is "four hundred million, five hundred twenty thousand, one hundred eleven".