30638213 has 2 divisors, whose sum is σ = 30638214. Its totient is φ = 30638212.

The previous prime is 30638207. The next prime is 30638243. The reversal of 30638213 is 31283603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23059204 + 7579009 = 4802^2 + 2753^2 .

It is a cyclic number.

It is not a de Polignac number, because 30638213 - 2⁴ = 30638197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30638243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15319106 + 15319107.

It is an arithmetic number, because the mean of its divisors is an integer number (15319107).

Almost surely, 2^30638213 is an apocalyptic number.

It is an amenable number.

30638213 is a deficient number, since it is larger than the sum of its proper divisors (1).

30638213 is an equidigital number, since it uses as much as digits as its factorization.

30638213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 30638213 is about 5535.1795815493. The cubic root of 30638213 is about 312.9112256617.

The spelling of 30638213 in words is "thirty million, six hundred thirty-eight thousand, two hundred thirteen".