18447025 has 9 divisors (see below), whose sum is σ = 22900971. Its totient is φ = 14740440.

The previous prime is 18447001. The next prime is 18447061. The reversal of 18447025 is 52074481.

The square root of 18447025 is 4295.

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

It can be written as a sum of positive squares in only one way, i.e., 6640929 + 11806096 = 2577^2 + 3436^2 .

It is not a de Polignac number, because 18447025 - 2²¹ = 16349873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21046 + ... + 21904.

Almost surely, 2^18447025 is an apocalyptic number.

18447025 is the 4295-th square number.

18447025 is the 2148-th centered octagonal number.

It is an amenable number.

18447025 is a deficient number, since it is larger than the sum of its proper divisors (4453946).

18447025 is an frugal number, since it uses more digits than its factorization.

18447025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728 (or 864 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The cubic root of 18447025 is about 264.2259362522.

The spelling of 18447025 in words is "eighteen million, four hundred forty-seven thousand, twenty-five".