18118722 has 8 divisors (see below), whose sum is σ = 36237456. Its totient is φ = 6039572.

The previous prime is 18118721. The next prime is 18118777. The reversal of 18118722 is 22781181.

It is a happy number.

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

18118722 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18118722.

It is not an unprimeable number, because it can be changed into a prime (18118721) 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, 1509888 + ... + 1509899.

It is an arithmetic number, because the mean of its divisors is an integer number (4529682).

Almost surely, 2^18118722 is an apocalyptic number.

18118722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18118722 is a wasteful number, since it uses less digits than its factorization.

18118722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3019792.

The product of its digits is 1792, while the sum is 30.

The square root of 18118722 is about 4256.6092139166. The cubic root of 18118722 is about 262.6490618238.

The spelling of 18118722 in words is "eighteen million, one hundred eighteen thousand, seven hundred twenty-two".