18000213 has 32 divisors (see below), whose sum is σ = 30965760. Its totient is φ = 9024960.

The previous prime is 18000209. The next prime is 18000217. The reversal of 18000213 is 31200081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18000209) and next prime (18000217).

It is not a de Polignac number, because 18000213 - 2² = 18000209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18000192 and 18000201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000217) 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 31 ways as a sum of consecutive naturals, for example, 5356 + ... + 8042.

It is an arithmetic number, because the mean of its divisors is an integer number (967680).

Almost surely, 2^18000213 is an apocalyptic number.

It is an amenable number.

18000213 is a deficient number, since it is larger than the sum of its proper divisors (12965547).

18000213 is a wasteful number, since it uses less digits than its factorization.

18000213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 18000213 is about 4242.6657893358. The cubic root of 18000213 is about 262.0751731537.

Adding to 18000213 its reverse (31200081), we get a palindrome (49200294).

The spelling of 18000213 in words is "eighteen million, two hundred thirteen", and thus it is an aban number.