18503530 has 16 divisors (see below), whose sum is σ = 35059680. Its totient is φ = 7011792.

The previous prime is 18503501. The next prime is 18503533. The reversal of 18503530 is 3530581.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18503495 and 18503504.

It is not an unprimeable number, because it can be changed into a prime (18503533) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 48504 + ... + 48883.

It is an arithmetic number, because the mean of its divisors is an integer number (2191230).

Almost surely, 2^18503530 is an apocalyptic number.

18503530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18503530 is a deficient number, since it is larger than the sum of its proper divisors (16556150).

18503530 is a wasteful number, since it uses less digits than its factorization.

18503530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97413.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 18503530 is about 4301.5729681129. The cubic root of 18503530 is about 264.4954443584.

The spelling of 18503530 in words is "eighteen million, five hundred three thousand, five hundred thirty".