400685 has 8 divisors (see below), whose sum is σ = 485376. Its totient is φ = 317520.

The previous prime is 400681. The next prime is 400703. The reversal of 400685 is 586004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400685 - 2² = 400681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 400685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320 + ... + 950.

It is an arithmetic number, because the mean of its divisors is an integer number (60672).

2⁴⁰⁰⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

400685 is a deficient number, since it is larger than the sum of its proper divisors (84691).

400685 is a wasteful number, since it uses less digits than its factorization.

400685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 400685 is about 632.9968404345. The cubic root of 400685 is about 73.7226653463.

Adding to 400685 its reverse (586004), we get a palindrome (986689).

The spelling of 400685 in words is "four hundred thousand, six hundred eighty-five".