18508240 has 80 divisors (see below), whose sum is σ = 47139840. Its totient is φ = 6727680.

The previous prime is 18508219. The next prime is 18508249. The reversal of 18508240 is 4280581.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 18508199 and 18508208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18508249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41941 + ... + 42379.

It is an arithmetic number, because the mean of its divisors is an integer number (589248).

Almost surely, 2^18508240 is an apocalyptic number.

18508240 is a gapful number since it is divisible by the number (10) 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 18508240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23569920).

18508240 is an abundant number, since it is smaller than the sum of its proper divisors (28631600).

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

18508240 is a wasteful number, since it uses less digits than its factorization.

18508240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 18508240 is about 4302.1204074270. The cubic root of 18508240 is about 264.5178845425.

The spelling of 18508240 in words is "eighteen million, five hundred eight thousand, two hundred forty".