18218928 has 160 divisors (see below), whose sum is σ = 59885056. Its totient is φ = 4644864.

The previous prime is 18218903. The next prime is 18218947. The reversal of 18218928 is 82981281.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187776 + ... + 187872.

Almost surely, 2^18218928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18218928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29942528).

18218928 is an abundant number, since it is smaller than the sum of its proper divisors (41666128).

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

18218928 is a wasteful number, since it uses less digits than its factorization.

18218928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 165 counting only the distinct ones).

The product of its digits is 18432, while the sum is 39.

The square root of 18218928 is about 4268.3636208739. The cubic root of 18218928 is about 263.1323674551.

It can be divided in two parts, 182 and 18928, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 18218928 in words is "eighteen million, two hundred eighteen thousand, nine hundred twenty-eight".