18452213 has 8 divisors (see below), whose sum is σ = 20077848. Its totient is φ = 16856064.

The previous prime is 18452209. The next prime is 18452221. The reversal of 18452213 is 31225481.

It can be written as a sum of positive squares in 4 ways, for example, as 669124 + 17783089 = 818^2 + 4217^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18452213 - 2² = 18452209 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 (18452243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6056 + ... + 8577.

It is an arithmetic number, because the mean of its divisors is an integer number (2509731).

Almost surely, 2^18452213 is an apocalyptic number.

18452213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18452213 is a deficient number, since it is larger than the sum of its proper divisors (1625635).

18452213 is a wasteful number, since it uses less digits than its factorization.

18452213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14743.

The product of its digits is 1920, while the sum is 26.

The square root of 18452213 is about 4295.6039156328. The cubic root of 18452213 is about 264.2507040340.

Adding to 18452213 its reverse (31225481), we get a palindrome (49677694).

The spelling of 18452213 in words is "eighteen million, four hundred fifty-two thousand, two hundred thirteen".