18142213 has 8 divisors (see below), whose sum is σ = 19678680. Its totient is φ = 16657920.

The previous prime is 18142199. The next prime is 18142217. The reversal of 18142213 is 31224181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20164 + 18122049 = 142^2 + 4257^2 .

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 18142213 - 2⁵ = 18142181 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 (18142217) 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, 12318 + ... + 13711.

It is an arithmetic number, because the mean of its divisors is an integer number (2459835).

Almost surely, 2^18142213 is an apocalyptic number.

It is an amenable number.

18142213 is a deficient number, since it is larger than the sum of its proper divisors (1536467).

18142213 is a wasteful number, since it uses less digits than its factorization.

18142213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26087.

The product of its digits is 384, while the sum is 22.

The square root of 18142213 is about 4259.3676760759. The cubic root of 18142213 is about 262.7625213456.

Adding to 18142213 its reverse (31224181), we get a palindrome (49366394).

The spelling of 18142213 in words is "eighteen million, one hundred forty-two thousand, two hundred thirteen".