18105025 has 27 divisors (see below), whose sum is σ = 24120201. Its totient is φ = 13479840.

The previous prime is 18105013. The next prime is 18105041. The reversal of 18105025 is 52050181.

The square root of 18105025 is 4255.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1718721 + 16386304 = 1311^2 + 4048^2 .

It is not a de Polignac number, because 18105025 - 2¹⁷ = 17973953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18104987 and 18105005.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 489307 + ... + 489343.

Almost surely, 2^18105025 is an apocalyptic number.

18105025 is the 4255-th square number.

18105025 is the 2128-th centered octagonal number.

It is an amenable number.

18105025 is a deficient number, since it is larger than the sum of its proper divisors (6015176).

18105025 is an equidigital number, since it uses as much as digits as its factorization.

18105025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The cubic root of 18105025 is about 262.5828612183.

Multiplying 18105025 by its product of nonzero digits (400), we get a square (7242010000 = 85100²).

The spelling of 18105025 in words is "eighteen million, one hundred five thousand, twenty-five".