18216530 has 16 divisors (see below), whose sum is σ = 33848064. Its totient is φ = 7051440.

The previous prime is 18216511. The next prime is 18216557. The reversal of 18216530 is 3561281.

It is a self number, because there is not a number n which added to its sum of digits gives 18216530.

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 7 ways as a sum of consecutive naturals, for example, 29072 + ... + 29691.

It is an arithmetic number, because the mean of its divisors is an integer number (2115504).

Almost surely, 2^18216530 is an apocalyptic number.

18216530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18216530 is a deficient number, since it is larger than the sum of its proper divisors (15631534).

18216530 is a wasteful number, since it uses less digits than its factorization.

18216530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58801.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 18216530 is about 4268.0827077272. The cubic root of 18216530 is about 263.1208223356.

The spelling of 18216530 in words is "eighteen million, two hundred sixteen thousand, five hundred thirty".