400166 has 8 divisors (see below), whose sum is σ = 646464. Its totient is φ = 184680.

The previous prime is 400157. The next prime is 400187. The reversal of 400166 is 661004.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

400166 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7670 + ... + 7721.

It is an arithmetic number, because the mean of its divisors is an integer number (80808).

2⁴⁰⁰¹⁶⁶ is an apocalyptic number.

400166 is a deficient number, since it is larger than the sum of its proper divisors (246298).

400166 is a wasteful number, since it uses less digits than its factorization.

400166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15406.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 400166 is about 632.5867529438. The cubic root of 400166 is about 73.6908210503.

The spelling of 400166 in words is "four hundred thousand, one hundred sixty-six".