38666213 has 2 divisors, whose sum is σ = 38666214. Its totient is φ = 38666212.

The previous prime is 38666189. The next prime is 38666219. The reversal of 38666213 is 31266683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34597924 + 4068289 = 5882^2 + 2017^2 .

It is a cyclic number.

It is not a de Polignac number, because 38666213 - 2¹⁰ = 38665189 is a prime.

It is a super-2 number, since 2×38666213² = 2990152055522738, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38666219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19333106 + 19333107.

It is an arithmetic number, because the mean of its divisors is an integer number (19333107).

Almost surely, 2^38666213 is an apocalyptic number.

It is an amenable number.

38666213 is a deficient number, since it is larger than the sum of its proper divisors (1).

38666213 is an equidigital number, since it uses as much as digits as its factorization.

38666213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 38666213 is about 6218.2162233232. The cubic root of 38666213 is about 338.1508989743.

The spelling of 38666213 in words is "thirty-eight million, six hundred sixty-six thousand, two hundred thirteen".