18758213 has 2 divisors, whose sum is σ = 18758214. Its totient is φ = 18758212.

The previous prime is 18758183. The next prime is 18758231. The reversal of 18758213 is 31285781.

Together with next prime (18758231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10452289 + 8305924 = 3233^2 + 2882^2 .

It is a cyclic number.

It is not a de Polignac number, because 18758213 - 2¹² = 18754117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18758713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9379106 + 9379107.

It is an arithmetic number, because the mean of its divisors is an integer number (9379107).

Almost surely, 2^18758213 is an apocalyptic number.

It is an amenable number.

18758213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18758213 is an equidigital number, since it uses as much as digits as its factorization.

18758213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 35.

The square root of 18758213 is about 4331.0752706458. The cubic root of 18758213 is about 265.7034260327.

The spelling of 18758213 in words is "eighteen million, seven hundred fifty-eight thousand, two hundred thirteen".