400165 has 8 divisors (see below), whose sum is σ = 484128. Its totient is φ = 317520.

The previous prime is 400157. The next prime is 400187. The reversal of 400165 is 561004.

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

It is not a de Polignac number, because 400165 - 2³ = 400157 is a prime.

It is a Duffinian number.

400165 is a modest number, since divided by 165 gives 40 as remainder.

400165 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 570 + ... + 1060.

It is an arithmetic number, because the mean of its divisors is an integer number (60516).

2⁴⁰⁰¹⁶⁵ is an apocalyptic number.

It is an amenable number.

400165 is a deficient number, since it is larger than the sum of its proper divisors (83963).

400165 is a wasteful number, since it uses less digits than its factorization.

400165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 400165 is about 632.5859625379. The cubic root of 400165 is about 73.6907596667.

Adding to 400165 its reverse (561004), we get a palindrome (961169).

It can be divided in two parts, 400 and 165, that added together give a palindrome (565).

The spelling of 400165 in words is "four hundred thousand, one hundred sixty-five".