18409625 has 16 divisors (see below), whose sum is σ = 24744720. Its totient is φ = 13593600.

The previous prime is 18409619. The next prime is 18409627. The reversal of 18409625 is 52690481.

It can be written as a sum of positive squares in 8 ways, for example, as 10863616 + 7546009 = 3296^2 + 2747^2 .

It is not a de Polignac number, because 18409625 - 2¹⁴ = 18393241 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18409627) 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 15 ways as a sum of consecutive naturals, for example, 4040 + ... + 7289.

It is an arithmetic number, because the mean of its divisors is an integer number (1546545).

Almost surely, 2^18409625 is an apocalyptic number.

It is an amenable number.

18409625 is a deficient number, since it is larger than the sum of its proper divisors (6335095).

18409625 is a wasteful number, since it uses less digits than its factorization.

18409625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11357 (or 11347 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 18409625 is about 4290.6438910728. The cubic root of 18409625 is about 264.0472491571.

The spelling of 18409625 in words is "eighteen million, four hundred nine thousand, six hundred twenty-five".