18022147 has 16 divisors (see below), whose sum is σ = 21315168. Its totient is φ = 15022080.

The previous prime is 18022141. The next prime is 18022153. The reversal of 18022147 is 74122081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18022141) and next prime (18022153).

It is a cyclic number.

It is not a de Polignac number, because 18022147 - 2⁷ = 18022019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18022141) 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 15 ways as a sum of consecutive naturals, for example, 27273 + ... + 27925.

It is an arithmetic number, because the mean of its divisors is an integer number (1332198).

Almost surely, 2^18022147 is an apocalyptic number.

18022147 is the 2123-rd decagonal number.

18022147 is a deficient number, since it is larger than the sum of its proper divisors (3293021).

18022147 is a wasteful number, since it uses less digits than its factorization.

18022147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 18022147 is about 4245.2499337495. The cubic root of 18022147 is about 262.1815797382.

The spelling of 18022147 in words is "eighteen million, twenty-two thousand, one hundred forty-seven".