18420030 has 24 divisors (see below), whose sum is σ = 47892312. Its totient is φ = 4911984.

The previous prime is 18420011. The next prime is 18420047. The reversal of 18420030 is 3002481.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18419985 and 18420012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102244 + ... + 102423.

It is an arithmetic number, because the mean of its divisors is an integer number (1995513).

Almost surely, 2^18420030 is an apocalyptic number.

18420030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18420030 is an abundant number, since it is smaller than the sum of its proper divisors (29472282).

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

18420030 is a wasteful number, since it uses less digits than its factorization.

18420030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204680 (or 204677 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 18420030 is about 4291.8562417677. The cubic root of 18420030 is about 264.0969857158.

The spelling of 18420030 in words is "eighteen million, four hundred twenty thousand, thirty".