18420168 has 64 divisors (see below), whose sum is σ = 50783040. Its totient is φ = 5531904.

The previous prime is 18420161. The next prime is 18420209. The reversal of 18420168 is 86102481.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18420161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12730 + ... + 14102.

It is an arithmetic number, because the mean of its divisors is an integer number (793485).

Almost surely, 2^18420168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18420168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25391520).

18420168 is an abundant number, since it is smaller than the sum of its proper divisors (32362872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18420168 is a wasteful number, since it uses less digits than its factorization.

18420168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438 (or 1434 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18420168 is about 4291.8723186973. The cubic root of 18420168 is about 264.0976452387.

The spelling of 18420168 in words is "eighteen million, four hundred twenty thousand, one hundred sixty-eight".