18021548 has 12 divisors (see below), whose sum is σ = 31747632. Its totient is φ = 8950800.

The previous prime is 18021529. The next prime is 18021569. The reversal of 18021548 is 84512081.

It is a self number, because there is not a number n which added to its sum of digits gives 18021548.

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 3 ways as a sum of consecutive naturals, for example, 14315 + ... + 15522.

It is an arithmetic number, because the mean of its divisors is an integer number (2645636).

Almost surely, 2^18021548 is an apocalyptic number.

It is an amenable number.

18021548 is a deficient number, since it is larger than the sum of its proper divisors (13726084).

18021548 is a wasteful number, since it uses less digits than its factorization.

18021548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29992 (or 29990 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 18021548 is about 4245.1793837246. The cubic root of 18021548 is about 262.1786750065.

The spelling of 18021548 in words is "eighteen million, twenty-one thousand, five hundred forty-eight".