18210522 has 16 divisors (see below), whose sum is σ = 39732192. Its totient is φ = 5518320.

The previous prime is 18210509. The next prime is 18210539. The reversal of 18210522 is 22501281.

It is a happy number.

It is a super-2 number, since 2×18210522² = 663246223024968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137893 + ... + 138024.

It is an arithmetic number, because the mean of its divisors is an integer number (2483262).

Almost surely, 2^18210522 is an apocalyptic number.

18210522 is an abundant number, since it is smaller than the sum of its proper divisors (21521670).

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

18210522 is a wasteful number, since it uses less digits than its factorization.

18210522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275933.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 18210522 is about 4267.3788207751. The cubic root of 18210522 is about 263.0918924987.

The spelling of 18210522 in words is "eighteen million, two hundred ten thousand, five hundred twenty-two".