18015625 has 14 divisors (see below), whose sum is σ = 22538774. Its totient is φ = 14400000.

The previous prime is 18015623. The next prime is 18015649. The reversal of 18015625 is 52651081.

It can be written as a sum of positive squares in 7 ways, for example, as 17749369 + 266256 = 4213^2 + 516^2 .

It is not a de Polignac number, because 18015625 - 2¹ = 18015623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18015593 and 18015602.

It is not an unprimeable number, because it can be changed into a prime (18015623) 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 in 13 ways as a sum of consecutive naturals, for example, 15049 + ... + 16201.

Almost surely, 2^18015625 is an apocalyptic number.

It is an amenable number.

18015625 is a deficient number, since it is larger than the sum of its proper divisors (4523149).

18015625 is an frugal number, since it uses more digits than its factorization.

18015625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 18015625 is about 4244.4817115874. The cubic root of 18015625 is about 262.1499491270.

The spelling of 18015625 in words is "eighteen million, fifteen thousand, six hundred twenty-five".