18120024 has 112 divisors (see below), whose sum is σ = 55087200. Its totient is φ = 5552064.

The previous prime is 18120023. The next prime is 18120049. The reversal of 18120024 is 42002181.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 18119979 and 18120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18120023) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 75697 + ... + 75935.

It is an arithmetic number, because the mean of its divisors is an integer number (491850).

Almost surely, 2^18120024 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 18120024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27543600).

18120024 is an abundant number, since it is smaller than the sum of its proper divisors (36967176).

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

18120024 is a wasteful number, since it uses less digits than its factorization.

18120024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 18120024 is about 4256.7621498035. The cubic root of 18120024 is about 262.6553529387.

The spelling of 18120024 in words is "eighteen million, one hundred twenty thousand, twenty-four".