18109224 has 192 divisors, whose sum is σ = 61560000. Its totient is φ = 4910976.

The previous prime is 18109213. The next prime is 18109237. The reversal of 18109224 is 42290181.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 306907 + ... + 306965.

It is an arithmetic number, because the mean of its divisors is an integer number (320625).

Almost surely, 2^18109224 is an apocalyptic number.

18109224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18109224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30780000).

18109224 is an abundant number, since it is smaller than the sum of its proper divisors (43450776).

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

18109224 is a wasteful number, since it uses less digits than its factorization.

18109224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18109224 is about 4255.4933909008. The cubic root of 18109224 is about 262.6031594542.

The spelling of 18109224 in words is "eighteen million, one hundred nine thousand, two hundred twenty-four".