18250213 has 4 divisors (see below), whose sum is σ = 18743500. Its totient is φ = 17756928.

The previous prime is 18250187. The next prime is 18250217. The reversal of 18250213 is 31205281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31205281 = 71 ⋅439511.

It can be written as a sum of positive squares in 2 ways, for example, as 17164449 + 1085764 = 4143^2 + 1042^2 .

It is a cyclic number.

It is not a de Polignac number, because 18250213 - 2⁹ = 18249701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18250217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246588 + ... + 246661.

It is an arithmetic number, because the mean of its divisors is an integer number (4685875).

Almost surely, 2^18250213 is an apocalyptic number.

It is an amenable number.

18250213 is a deficient number, since it is larger than the sum of its proper divisors (493287).

18250213 is an equidigital number, since it uses as much as digits as its factorization.

18250213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493286.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18250213 is about 4272.0268023504. The cubic root of 18250213 is about 263.2828956793.

Adding to 18250213 its reverse (31205281), we get a palindrome (49455494).

The spelling of 18250213 in words is "eighteen million, two hundred fifty thousand, two hundred thirteen".