168404 has 6 divisors (see below), whose sum is σ = 294714. Its totient is φ = 84200.

The previous prime is 168391. The next prime is 168409. The reversal of 168404 is 404861.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 158404 + 10000 = 398^2 + 100^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 168404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168409) by changing a digit.

168404 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 as a sum of consecutive naturals, namely, 21047 + ... + 21054.

It is an arithmetic number, because the mean of its divisors is an integer number (49119).

2¹⁶⁸⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

168404 is a deficient number, since it is larger than the sum of its proper divisors (126310).

168404 is a wasteful number, since it uses less digits than its factorization.

168404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42105 (or 42103 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 168404 is about 410.3705642465. The cubic root of 168404 is about 55.2226784921. Note that the first 3 decimals are identical.

The spelling of 168404 in words is "one hundred sixty-eight thousand, four hundred four".