18501225 has 12 divisors (see below), whose sum is σ = 30588816. Its totient is φ = 9867280.

The previous prime is 18501199. The next prime is 18501227. The reversal of 18501225 is 52210581.

It is not a de Polignac number, because 18501225 - 2¹⁶ = 18435689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18501195 and 18501204.

It is not an unprimeable number, because it can be changed into a prime (18501227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123267 + ... + 123416.

It is an arithmetic number, because the mean of its divisors is an integer number (2549068).

Almost surely, 2^18501225 is an apocalyptic number.

18501225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18501225 is a deficient number, since it is larger than the sum of its proper divisors (12087591).

18501225 is a wasteful number, since it uses less digits than its factorization.

18501225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246696 (or 246691 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 18501225 is about 4301.3050345215. The cubic root of 18501225 is about 264.4844610971.

The spelling of 18501225 in words is "eighteen million, five hundred one thousand, two hundred twenty-five".