18700213 has 6 divisors (see below), whose sum is σ = 21753366. Its totient is φ = 16028712.

The previous prime is 18700211. The next prime is 18700217. The reversal of 18700213 is 31200781.

It can be written as a sum of positive squares in only one way, i.e., 14607684 + 4092529 = 3822^2 + 2023^2 .

It is not a de Polignac number, because 18700213 - 2¹ = 18700211 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 (18700211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 190770 + ... + 190867.

It is an arithmetic number, because the mean of its divisors is an integer number (3625561).

Almost surely, 2^18700213 is an apocalyptic number.

It is an amenable number.

18700213 is a deficient number, since it is larger than the sum of its proper divisors (3053153).

18700213 is an equidigital number, since it uses as much as digits as its factorization.

18700213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381651 (or 381644 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 18700213 is about 4324.3742899985. The cubic root of 18700213 is about 265.4292934996.

Adding to 18700213 its reverse (31200781), we get a palindrome (49900994).

The spelling of 18700213 in words is "eighteen million, seven hundred thousand, two hundred thirteen".