18668530 has 16 divisors (see below), whose sum is σ = 34423704. Its totient is φ = 7285120.

The previous prime is 18668513. The next prime is 18668549. The reversal of 18668530 is 3586681.

It can be written as a sum of positive squares in 4 ways, for example, as 10042561 + 8625969 = 3169^2 + 2937^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18668530.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22357 + ... + 23176.

Almost surely, 2^18668530 is an apocalyptic number.

18668530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18668530 is a deficient number, since it is larger than the sum of its proper divisors (15755174).

18668530 is a wasteful number, since it uses less digits than its factorization.

18668530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45581.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 18668530 is about 4320.7094324891. The cubic root of 18668530 is about 265.2793067922.

The spelling of 18668530 in words is "eighteen million, six hundred sixty-eight thousand, five hundred thirty".