18242280 has 256 divisors, whose sum is σ = 73728000. Its totient is φ = 3919104.

The previous prime is 18242249. The next prime is 18242281. The reversal of 18242280 is 8224281.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18242281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 143577 + ... + 143703.

It is an arithmetic number, because the mean of its divisors is an integer number (288000).

Almost surely, 2^18242280 is an apocalyptic number.

18242280 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 18242280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36864000).

18242280 is an abundant number, since it is smaller than the sum of its proper divisors (55485720).

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

18242280 is a wasteful number, since it uses less digits than its factorization.

18242280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 18242280 is about 4271.0982194279. The cubic root of 18242280 is about 263.2447422266.

The spelling of 18242280 in words is "eighteen million, two hundred forty-two thousand, two hundred eighty".