18500245 has 4 divisors (see below), whose sum is σ = 22200300. Its totient is φ = 14800192.

The previous prime is 18500239. The next prime is 18500249. The reversal of 18500245 is 54200581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54200581 = 23 ⋅2356547.

It can be written as a sum of positive squares in 2 ways, for example, as 11242609 + 7257636 = 3353^2 + 2694^2 .

It is a cyclic number.

It is not a de Polignac number, because 18500245 - 2⁷ = 18500117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18500249) 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 3 ways as a sum of consecutive naturals, for example, 1850020 + ... + 1850029.

It is an arithmetic number, because the mean of its divisors is an integer number (5550075).

Almost surely, 2^18500245 is an apocalyptic number.

It is an amenable number.

18500245 is a deficient number, since it is larger than the sum of its proper divisors (3700055).

18500245 is an equidigital number, since it uses as much as digits as its factorization.

18500245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700054.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 18500245 is about 4301.1911140985. The cubic root of 18500245 is about 264.4797911478.

The spelling of 18500245 in words is "eighteen million, five hundred thousand, two hundred forty-five".