400985 has 16 divisors (see below), whose sum is σ = 537600. Its totient is φ = 285120.

The previous prime is 400963. The next prime is 400997. The reversal of 400985 is 589004.

400985 = T₄ + T₅ + ... + T₁₃₃.

It is not a de Polignac number, because 400985 - 2¹⁶ = 335449 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 400985.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1916 + ... + 2114.

It is an arithmetic number, because the mean of its divisors is an integer number (33600).

2⁴⁰⁰⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

400985 is a deficient number, since it is larger than the sum of its proper divisors (136615).

400985 is a wasteful number, since it uses less digits than its factorization.

400985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 400985 is about 633.2337641030. The cubic root of 400985 is about 73.7410599141.

Adding to 400985 its reverse (589004), we get a palindrome (989989).

The spelling of 400985 in words is "four hundred thousand, nine hundred eighty-five".