18022516 has 12 divisors (see below), whose sum is σ = 33394788. Its totient is φ = 8481152.

The previous prime is 18022513. The next prime is 18022517. The reversal of 18022516 is 61522081.

It can be written as a sum of positive squares in 2 ways, for example, as 16434916 + 1587600 = 4054^2 + 1260^2 .

It is a super-2 number, since 2×18022516² = 649622165940512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18022513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132451 + ... + 132586.

It is an arithmetic number, because the mean of its divisors is an integer number (2782899).

Almost surely, 2^18022516 is an apocalyptic number.

It is an amenable number.

18022516 is a deficient number, since it is larger than the sum of its proper divisors (15372272).

18022516 is a wasteful number, since it uses less digits than its factorization.

18022516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265058 (or 265056 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 18022516 is about 4245.2933938657. The cubic root of 18022516 is about 262.1833690985.

Adding to 18022516 its reverse (61522081), we get a palindrome (79544597).

The spelling of 18022516 in words is "eighteen million, twenty-two thousand, five hundred sixteen".