18109952 has 80 divisors (see below), whose sum is σ = 42949632. Its totient is φ = 7464960.

The previous prime is 18109951. The next prime is 18109961. The reversal of 18109952 is 25990181.

It is a super-2 number, since 2×18109952² = 655940722884608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18109951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111023 + ... + 111185.

Almost surely, 2^18109952 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 18109952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21474816).

18109952 is an abundant number, since it is smaller than the sum of its proper divisors (24839680).

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

18109952 is an equidigital number, since it uses as much as digits as its factorization.

18109952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 18109952 is about 4255.5789265387. The cubic root of 18109952 is about 262.6066783339.

The spelling of 18109952 in words is "eighteen million, one hundred nine thousand, nine hundred fifty-two".