18022347 has 18 divisors (see below), whose sum is σ = 30283188. Its totient is φ = 10298232.

The previous prime is 18022343. The next prime is 18022379. The reversal of 18022347 is 74322081.

It is not a de Polignac number, because 18022347 - 2² = 18022343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18022347.

It is not an unprimeable number, because it can be changed into a prime (18022343) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 19993 + ... + 20874.

Almost surely, 2^18022347 is an apocalyptic number.

18022347 is a deficient number, since it is larger than the sum of its proper divisors (12260841).

18022347 is a wasteful number, since it uses less digits than its factorization.

18022347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40887 (or 40877 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 18022347 is about 4245.2734894233. The cubic root of 18022347 is about 262.1825495842.

The spelling of 18022347 in words is "eighteen million, twenty-two thousand, three hundred forty-seven".