400085 has 24 divisors (see below), whose sum is σ = 590976. Its totient is φ = 258720.

The previous prime is 400069. The next prime is 400087. The reversal of 400085 is 580004.

It is not a de Polignac number, because 400085 - 2⁴ = 400069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5600 + ... + 5670.

It is an arithmetic number, because the mean of its divisors is an integer number (24624).

2⁴⁰⁰⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

400085 is a deficient number, since it is larger than the sum of its proper divisors (190891).

400085 is a wasteful number, since it uses less digits than its factorization.

400085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 400085 is about 632.5227268644. The cubic root of 400085 is about 73.6858486478.

Adding to 400085 its reverse (580004), we get a palindrome (980089).

The spelling of 400085 in words is "four hundred thousand, eighty-five".