18204213 has 8 divisors (see below), whose sum is σ = 24296128. Its totient is φ = 12124224.

The previous prime is 18204211. The next prime is 18204217. The reversal of 18204213 is 31240281.

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

It is not a de Polignac number, because 18204213 - 2¹ = 18204211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18204213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18204211) 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, 1581 + ... + 6237.

It is an arithmetic number, because the mean of its divisors is an integer number (3037016).

Almost surely, 2^18204213 is an apocalyptic number.

It is an amenable number.

18204213 is a deficient number, since it is larger than the sum of its proper divisors (6091915).

18204213 is a wasteful number, since it uses less digits than its factorization.

18204213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5963.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18204213 is about 4266.6395441846. The cubic root of 18204213 is about 263.0615064309.

Adding to 18204213 its reverse (31240281), we get a palindrome (49444494).

The spelling of 18204213 in words is "eighteen million, two hundred four thousand, two hundred thirteen".