18280242 has 40 divisors (see below), whose sum is σ = 43124400. Its totient is φ = 5771736.

The previous prime is 18280231. The next prime is 18280247. The reversal of 18280242 is 24208281.

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

It is not an unprimeable number, because it can be changed into a prime (18280247) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 109 + ... + 6047.

It is an arithmetic number, because the mean of its divisors is an integer number (1078110).

Almost surely, 2^18280242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18280242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21562200).

18280242 is an abundant number, since it is smaller than the sum of its proper divisors (24844158).

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

18280242 is a wasteful number, since it uses less digits than its factorization.

18280242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5972 (or 5963 counting only the distinct ones).

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

The square root of 18280242 is about 4275.5399658990. The cubic root of 18280242 is about 263.4272189222.

The spelling of 18280242 in words is "eighteen million, two hundred eighty thousand, two hundred forty-two".