18117822 has 16 divisors (see below), whose sum is σ = 36288000. Its totient is φ = 6030552.

The previous prime is 18117817. The next prime is 18117829. The reversal of 18117822 is 22871181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18117822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18117829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3429 + ... + 6927.

It is an arithmetic number, because the mean of its divisors is an integer number (2268000).

Almost surely, 2^18117822 is an apocalyptic number.

18117822 is an abundant number, since it is smaller than the sum of its proper divisors (18170178).

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

18117822 is a wasteful number, since it uses less digits than its factorization.

18117822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4367.

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

The square root of 18117822 is about 4256.5034946538. The cubic root of 18117822 is about 262.6447129507.

The spelling of 18117822 in words is "eighteen million, one hundred seventeen thousand, eight hundred twenty-two".