18503225 has 36 divisors (see below), whose sum is σ = 26381124. Its totient is φ = 12794880.

The previous prime is 18503209. The next prime is 18503227. The reversal of 18503225 is 52230581.

It can be written as a sum of positive squares in 18 ways, for example, as 4343056 + 14160169 = 2084^2 + 3763^2 .

It is not a de Polignac number, because 18503225 - 2⁴ = 18503209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18503194 and 18503203.

It is not an unprimeable number, because it can be changed into a prime (18503227) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 93827 + ... + 94023.

It is an arithmetic number, because the mean of its divisors is an integer number (732809).

Almost surely, 2^18503225 is an apocalyptic number.

It is an amenable number.

18503225 is a deficient number, since it is larger than the sum of its proper divisors (7877899).

18503225 is a wasteful number, since it uses less digits than its factorization.

18503225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 18503225 is about 4301.5375158192. The cubic root of 18503225 is about 264.4939910942.

The spelling of 18503225 in words is "eighteen million, five hundred three thousand, two hundred twenty-five".