18664530 has 16 divisors (see below), whose sum is σ = 44794944. Its totient is φ = 4977200.

The previous prime is 18664501. The next prime is 18664543. The reversal of 18664530 is 3546681.

It is a junction number, because it is equal to n+sod(n) for n = 18664491 and 18664500.

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 7 ways as a sum of consecutive naturals, for example, 311046 + ... + 311105.

It is an arithmetic number, because the mean of its divisors is an integer number (2799684).

Almost surely, 2^18664530 is an apocalyptic number.

18664530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18664530 is an abundant number, since it is smaller than the sum of its proper divisors (26130414).

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

18664530 is a wasteful number, since it uses less digits than its factorization.

18664530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622161.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 18664530 is about 4320.2465207439. The cubic root of 18664530 is about 265.2603588082.

The spelling of 18664530 in words is "eighteen million, six hundred sixty-four thousand, five hundred thirty".