18510225 has 12 divisors (see below), whose sum is σ = 30603696. Its totient is φ = 9872080.

The previous prime is 18510223. The next prime is 18510227. The reversal of 18510225 is 52201581.

It is an interprime number because it is at equal distance from previous prime (18510223) and next prime (18510227).

It is not a de Polignac number, because 18510225 - 2¹ = 18510223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18510195 and 18510204.

It is not an unprimeable number, because it can be changed into a prime (18510221) 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 11 ways as a sum of consecutive naturals, for example, 123327 + ... + 123476.

It is an arithmetic number, because the mean of its divisors is an integer number (2550308).

Almost surely, 2^18510225 is an apocalyptic number.

18510225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18510225 is a deficient number, since it is larger than the sum of its proper divisors (12093471).

18510225 is a wasteful number, since it uses less digits than its factorization.

18510225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246816 (or 246811 counting only the distinct ones).

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

The square root of 18510225 is about 4302.3511014328. The cubic root of 18510225 is about 264.5273406772.

The spelling of 18510225 in words is "eighteen million, five hundred ten thousand, two hundred twenty-five".