18345213 has 12 divisors (see below), whose sum is σ = 26634400. Its totient is φ = 12167496.

The previous prime is 18345209. The next prime is 18345263. The reversal of 18345213 is 31254381.

It is a happy number.

It is not a de Polignac number, because 18345213 - 2² = 18345209 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 (18345263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3331 + ... + 6912.

Almost surely, 2^18345213 is an apocalyptic number.

It is an amenable number.

18345213 is a deficient number, since it is larger than the sum of its proper divisors (8289187).

18345213 is a wasteful number, since it uses less digits than its factorization.

18345213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10448 (or 10445 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 18345213 is about 4283.1312144271. The cubic root of 18345213 is about 263.7389378648.

Adding to 18345213 its reverse (31254381), we get a palindrome (49599594).

The spelling of 18345213 in words is "eighteen million, three hundred forty-five thousand, two hundred thirteen".