400168 has 8 divisors (see below), whose sum is σ = 750330. Its totient is φ = 200080.

The previous prime is 400157. The next prime is 400187. The reversal of 400168 is 861004.

It can be written as a sum of positive squares in only one way, i.e., 311364 + 88804 = 558^2 + 298^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25003 + ... + 25018.

2⁴⁰⁰¹⁶⁸ is an apocalyptic number.

It is an amenable number.

400168 is a deficient number, since it is larger than the sum of its proper divisors (350162).

400168 is a wasteful number, since it uses less digits than its factorization.

400168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50027 (or 50023 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 400168 is about 632.5883337527. The cubic root of 400168 is about 73.6909438172.

The spelling of 400168 in words is "four hundred thousand, one hundred sixty-eight".