18222512 has 60 divisors (see below), whose sum is σ = 44825256. Its totient is φ = 7096320.

The previous prime is 18222473. The next prime is 18222541. The reversal of 18222512 is 21522281.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7568 + ... + 9680.

Almost surely, 2^18222512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18222512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22412628).

18222512 is an abundant number, since it is smaller than the sum of its proper divisors (26602744).

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

18222512 is a wasteful number, since it uses less digits than its factorization.

18222512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146 (or 2133 counting only the distinct ones).

The product of its digits is 640, while the sum is 23.

The square root of 18222512 is about 4268.7834332512. The cubic root of 18222512 is about 263.1496206577.

Adding to 18222512 its reverse (21522281), we get a palindrome (39744793).

It can be divided in two parts, 1822 and 2512, that added together give a palindrome (4334).

The spelling of 18222512 in words is "eighteen million, two hundred twenty-two thousand, five hundred twelve".