18288930 has 64 divisors (see below), whose sum is σ = 48325248. Its totient is φ = 4392960.

The previous prime is 18288929. The next prime is 18288953. The reversal of 18288930 is 3988281.

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, 51634 + ... + 51986.

It is an arithmetic number, because the mean of its divisors is an integer number (755082).

Almost surely, 2^18288930 is an apocalyptic number.

18288930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18288930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24162624).

18288930 is an abundant number, since it is smaller than the sum of its proper divisors (30036318).

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

18288930 is a wasteful number, since it uses less digits than its factorization.

18288930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 18288930 is about 4276.5558572290. Note that the first 3 decimals coincide. The cubic root of 18288930 is about 263.4689450876.

The spelling of 18288930 in words is "eighteen million, two hundred eighty-eight thousand, nine hundred thirty".