18072229 has 12 divisors (see below), whose sum is σ = 21143808. Its totient is φ = 15401400.

The previous prime is 18072209. The next prime is 18072247. The reversal of 18072229 is 92227081.

It is not a de Polignac number, because 18072229 - 2¹⁹ = 17547941 is a prime.

It is a super-2 number, since 2×18072229² = 653210922056882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18072229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18072209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8394 + ... + 10324.

It is an arithmetic number, because the mean of its divisors is an integer number (1761984).

Almost surely, 2^18072229 is an apocalyptic number.

It is an amenable number.

18072229 is a deficient number, since it is larger than the sum of its proper divisors (3071579).

18072229 is a wasteful number, since it uses less digits than its factorization.

18072229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136 (or 2129 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18072229 is about 4251.1444341495. The cubic root of 18072229 is about 262.4242151597.

The spelling of 18072229 in words is "eighteen million, seventy-two thousand, two hundred twenty-nine".