18222081 has 8 divisors (see below), whose sum is σ = 24888864. Its totient is φ = 11851680.

The previous prime is 18222059. The next prime is 18222097. The reversal of 18222081 is 18022281.

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

It is not a de Polignac number, because 18222081 - 2⁷ = 18221953 is a prime.

It is a super-2 number, since 2×18222081² = 664088471941122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18222031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73951 + ... + 74196.

It is an arithmetic number, because the mean of its divisors is an integer number (3111108).

Almost surely, 2^18222081 is an apocalyptic number.

It is an amenable number.

18222081 is a deficient number, since it is larger than the sum of its proper divisors (6666783).

18222081 is a wasteful number, since it uses less digits than its factorization.

18222081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148191.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 18222081 is about 4268.7329501856. The cubic root of 18222081 is about 263.1475459643.

The spelling of 18222081 in words is "eighteen million, two hundred twenty-two thousand, eighty-one".