18195172 has 6 divisors (see below), whose sum is σ = 31841558. Its totient is φ = 9097584.

The previous prime is 18195169. The next prime is 18195173. The reversal of 18195172 is 27159181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16597476 + 1597696 = 4074^2 + 1264^2 .

It is not an unprimeable number, because it can be changed into a prime (18195173) 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 as a sum of consecutive naturals, namely, 2274393 + ... + 2274400.

Almost surely, 2^18195172 is an apocalyptic number.

It is an amenable number.

18195172 is a deficient number, since it is larger than the sum of its proper divisors (13646386).

18195172 is a wasteful number, since it uses less digits than its factorization.

18195172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4548797 (or 4548795 counting only the distinct ones).

The product of its digits is 5040, while the sum is 34.

The square root of 18195172 is about 4265.5799136811. The cubic root of 18195172 is about 263.0179499765.

The spelling of 18195172 in words is "eighteen million, one hundred ninety-five thousand, one hundred seventy-two".