400205 has 16 divisors (see below), whose sum is σ = 532224. Its totient is φ = 287040.

The previous prime is 400199. The next prime is 400207. The reversal of 400205 is 502004.

It is not a de Polignac number, because 400205 - 2¹⁰ = 399181 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 (400207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2990 + ... + 3120.

It is an arithmetic number, because the mean of its divisors is an integer number (33264).

2⁴⁰⁰²⁰⁵ is an apocalyptic number.

It is an amenable number.

400205 is a deficient number, since it is larger than the sum of its proper divisors (132019).

400205 is a wasteful number, since it uses less digits than its factorization.

400205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196.

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 400205 is about 632.6175780043. The cubic root of 400205 is about 73.6932149307.

Adding to 400205 its reverse (502004), we get a palindrome (902209).

The spelling of 400205 in words is "four hundred thousand, two hundred five".