18003630 has 32 divisors (see below), whose sum is σ = 43325568. Its totient is φ = 4788000.

The previous prime is 18003617. The next prime is 18003691. The reversal of 18003630 is 3630081.

It is a junction number, because it is equal to n+sod(n) for n = 18003597 and 18003606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16605 + ... + 17655.

It is an arithmetic number, because the mean of its divisors is an integer number (1353924).

Almost surely, 2^18003630 is an apocalyptic number.

18003630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18003630 is an abundant number, since it is smaller than the sum of its proper divisors (25321938).

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

18003630 is a wasteful number, since it uses less digits than its factorization.

18003630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 18003630 is about 4243.0684651558. The cubic root of 18003630 is about 262.0917554428.

The spelling of 18003630 in words is "eighteen million, three thousand, six hundred thirty".