18321172 has 12 divisors (see below), whose sum is σ = 33948180. Its totient is φ = 8621696.

The previous prime is 18321169. The next prime is 18321203. The reversal of 18321172 is 27112381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7862416 + 10458756 = 2804^2 + 3234^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134647 + ... + 134782.

It is an arithmetic number, because the mean of its divisors is an integer number (2829015).

Almost surely, 2^18321172 is an apocalyptic number.

It is an amenable number.

18321172 is a deficient number, since it is larger than the sum of its proper divisors (15627008).

18321172 is a wasteful number, since it uses less digits than its factorization.

18321172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269450 (or 269448 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 18321172 is about 4280.3238195258. The cubic root of 18321172 is about 263.6236794676.

The spelling of 18321172 in words is "eighteen million, three hundred twenty-one thousand, one hundred seventy-two".