18222518 has 8 divisors (see below), whose sum is σ = 27354360. Its totient is φ = 9104400.

The previous prime is 18222473. The next prime is 18222541. The reversal of 18222518 is 81522281.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073 + ... + 6131.

It is an arithmetic number, because the mean of its divisors is an integer number (3419295).

Almost surely, 2^18222518 is an apocalyptic number.

18222518 is a deficient number, since it is larger than the sum of its proper divisors (9131842).

18222518 is a wasteful number, since it uses less digits than its factorization.

18222518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6862.

The product of its digits is 2560, while the sum is 29.

The square root of 18222518 is about 4268.7841360275. The cubic root of 18222518 is about 263.1496495396.

Adding to 18222518 its reverse (81522281), we get a palindrome (99744799).

The spelling of 18222518 in words is "eighteen million, two hundred twenty-two thousand, five hundred eighteen".