18172025 has 12 divisors (see below), whose sum is σ = 22614252. Its totient is φ = 14485440.

The previous prime is 18172019. The next prime is 18172073. The reversal of 18172025 is 52027181.

It can be written as a sum of positive squares in 6 ways, for example, as 4541161 + 13630864 = 2131^2 + 3692^2 .

It is not a de Polignac number, because 18172025 - 2¹⁰ = 18171001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18171985 and 18172003.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 6779 + ... + 9071.

It is an arithmetic number, because the mean of its divisors is an integer number (1884521).

Almost surely, 2^18172025 is an apocalyptic number.

It is an amenable number.

18172025 is a deficient number, since it is larger than the sum of its proper divisors (4442227).

18172025 is a wasteful number, since it uses less digits than its factorization.

18172025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620 (or 2615 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 18172025 is about 4262.8658200793. The cubic root of 18172025 is about 262.9063698283.

The spelling of 18172025 in words is "eighteen million, one hundred seventy-two thousand, twenty-five".