400885 has 4 divisors (see below), whose sum is σ = 481068. Its totient is φ = 320704.

The previous prime is 400871. The next prime is 400903. The reversal of 400885 is 588004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 152881 + 248004 = 391^2 + 498^2 .

It is a cyclic number.

It is not a de Polignac number, because 400885 - 2⁵ = 400853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40084 + ... + 40093.

It is an arithmetic number, because the mean of its divisors is an integer number (120267).

2⁴⁰⁰⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

400885 is a deficient number, since it is larger than the sum of its proper divisors (80183).

400885 is an equidigital number, since it uses as much as digits as its factorization.

400885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80182.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 400885 is about 633.1547993974. The cubic root of 400885 is about 73.7349294112.

Adding to 400885 its reverse (588004), we get a palindrome (988889).

The spelling of 400885 in words is "four hundred thousand, eight hundred eighty-five".