18100172 has 48 divisors (see below), whose sum is σ = 35707392. Its totient is φ = 7983360.

The previous prime is 18100171. The next prime is 18100177. The reversal of 18100172 is 27100181.

It is not an unprimeable number, because it can be changed into a prime (18100171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110963 + ... + 111125.

It is an arithmetic number, because the mean of its divisors is an integer number (743904).

Almost surely, 2^18100172 is an apocalyptic number.

It is an amenable number.

18100172 is a deficient number, since it is larger than the sum of its proper divisors (17607220).

18100172 is a wasteful number, since it uses less digits than its factorization.

18100172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 18100172 is about 4254.4296915098. The cubic root of 18100172 is about 262.5593975942.

Subtracting 18100172 from its reverse (27100181), we obtain a palindrome (9000009).

The spelling of 18100172 in words is "eighteen million, one hundred thousand, one hundred seventy-two".