18182213 has 16 divisors (see below), whose sum is σ = 22388736. Its totient is φ = 14422320.

The previous prime is 18182201. The next prime is 18182251. The reversal of 18182213 is 31228181.

It is a cyclic number.

It is not a de Polignac number, because 18182213 - 2⁶ = 18182149 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 (18182293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3170 + ... + 6812.

It is an arithmetic number, because the mean of its divisors is an integer number (1399296).

Almost surely, 2^18182213 is an apocalyptic number.

It is an amenable number.

18182213 is a deficient number, since it is larger than the sum of its proper divisors (4206523).

18182213 is a wasteful number, since it uses less digits than its factorization.

18182213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704.

The product of its digits is 768, while the sum is 26.

The square root of 18182213 is about 4264.0606233964. The cubic root of 18182213 is about 262.9554927649.

The spelling of 18182213 in words is "eighteen million, one hundred eighty-two thousand, two hundred thirteen".