18400168 has 8 divisors (see below), whose sum is σ = 34500330. Its totient is φ = 9200080.

The previous prime is 18400163. The next prime is 18400177. The reversal of 18400168 is 86100481.

It can be written as a sum of positive squares in only one way, i.e., 10771524 + 7628644 = 3282^2 + 2762^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18400163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1150003 + ... + 1150018.

Almost surely, 2^18400168 is an apocalyptic number.

It is an amenable number.

18400168 is a deficient number, since it is larger than the sum of its proper divisors (16100162).

18400168 is a wasteful number, since it uses less digits than its factorization.

18400168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300027 (or 2300023 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 18400168 is about 4289.5417004617. The cubic root of 18400168 is about 264.0020278387.

The spelling of 18400168 in words is "eighteen million, four hundred thousand, one hundred sixty-eight".