18860213 has 2 divisors, whose sum is σ = 18860214. Its totient is φ = 18860212.

The previous prime is 18860167. The next prime is 18860221. The reversal of 18860213 is 31206881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17656804 + 1203409 = 4202^2 + 1097^2 .

It is an emirp because it is prime and its reverse (31206881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18860213 - 2⁸ = 18859957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18860263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9430106 + 9430107.

It is an arithmetic number, because the mean of its divisors is an integer number (9430107).

Almost surely, 2^18860213 is an apocalyptic number.

It is an amenable number.

18860213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18860213 is an equidigital number, since it uses as much as digits as its factorization.

18860213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18860213 is about 4342.8346733441. The cubic root of 18860213 is about 266.1841536714.

The spelling of 18860213 in words is "eighteen million, eight hundred sixty thousand, two hundred thirteen".