18066172 has 24 divisors (see below), whose sum is σ = 33611760. Its totient is φ = 8467200.

The previous prime is 18066157. The next prime is 18066179. The reversal of 18066172 is 27166081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18066179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25422 + ... + 26122.

It is an arithmetic number, because the mean of its divisors is an integer number (1400490).

Almost surely, 2^18066172 is an apocalyptic number.

It is an amenable number.

18066172 is a deficient number, since it is larger than the sum of its proper divisors (15545588).

18066172 is a wasteful number, since it uses less digits than its factorization.

18066172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101 (or 1099 counting only the distinct ones).

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

The square root of 18066172 is about 4250.4319780465. The cubic root of 18066172 is about 262.3948942778.

Subtracting 18066172 from its reverse (27166081), we obtain a palindrome (9099909).

The spelling of 18066172 in words is "eighteen million, sixty-six thousand, one hundred seventy-two".