18838530 has 24 divisors (see below), whose sum is σ = 48980412. Its totient is φ = 5023584.

The previous prime is 18838529. The next prime is 18838553. The reversal of 18838530 is 3583881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15186609 + 3651921 = 3897^2 + 1911^2 .

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, 104569 + ... + 104748.

Almost surely, 2^18838530 is an apocalyptic number.

18838530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18838530 is an abundant number, since it is smaller than the sum of its proper divisors (30141882).

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

18838530 is a wasteful number, since it uses less digits than its factorization.

18838530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209330 (or 209327 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 18838530 is about 4340.3375444774. The cubic root of 18838530 is about 266.0821066752.

The spelling of 18838530 in words is "eighteen million, eight hundred thirty-eight thousand, five hundred thirty".