400255 has 4 divisors (see below), whose sum is σ = 480312. Its totient is φ = 320200.

The previous prime is 400249. The next prime is 400261. The reversal of 400255 is 552004.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (400249) and next prime (400261).

It is not a de Polignac number, because 400255 - 2³ = 400247 is a prime.

It is a Duffinian number.

400255 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40021 + ... + 40030.

It is an arithmetic number, because the mean of its divisors is an integer number (120078).

2⁴⁰⁰²⁵⁵ is an apocalyptic number.

400255 is a deficient number, since it is larger than the sum of its proper divisors (80057).

400255 is an equidigital number, since it uses as much as digits as its factorization.

400255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80056.

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 400255 is about 632.6570951155. The cubic root of 400255 is about 73.6962837807.

Adding to 400255 its reverse (552004), we get a palindrome (952259).

The spelling of 400255 in words is "four hundred thousand, two hundred fifty-five".