18287022 has 32 divisors (see below), whose sum is σ = 39809952. Its totient is φ = 5566464.

The previous prime is 18287021. The next prime is 18287033. The reversal of 18287022 is 22078281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18287021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6358 + ... + 8774.

It is an arithmetic number, because the mean of its divisors is an integer number (1244061).

Almost surely, 2^18287022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18287022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19904976).

18287022 is an abundant number, since it is smaller than the sum of its proper divisors (21522930).

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

18287022 is a wasteful number, since it uses less digits than its factorization.

18287022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 18287022 is about 4276.3327747031. The cubic root of 18287022 is about 263.4597826009.

The spelling of 18287022 in words is "eighteen million, two hundred eighty-seven thousand, twenty-two".