18290213 has 8 divisors (see below), whose sum is σ = 19006680. Its totient is φ = 17579520.

The previous prime is 18290203. The next prime is 18290219. The reversal of 18290213 is 31209281.

It can be written as a sum of positive squares in 4 ways, for example, as 10349089 + 7941124 = 3217^2 + 2818^2 .

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 18290213 - 2¹² = 18286117 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 (18290219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5681 + ... + 8297.

It is an arithmetic number, because the mean of its divisors is an integer number (2375835).

Almost surely, 2^18290213 is an apocalyptic number.

It is an amenable number.

18290213 is a deficient number, since it is larger than the sum of its proper divisors (716467).

18290213 is a wasteful number, since it uses less digits than its factorization.

18290213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2887.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 18290213 is about 4276.7058584850. The cubic root of 18290213 is about 263.4751058772.

Adding to 18290213 its reverse (31209281), we get a palindrome (49499494).

The spelling of 18290213 in words is "eighteen million, two hundred ninety thousand, two hundred thirteen".