38938181 has 2 divisors, whose sum is σ = 38938182. Its totient is φ = 38938180.

The previous prime is 38938153. The next prime is 38938187. The reversal of 38938181 is 18183983.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28793956 + 10144225 = 5366^2 + 3185^2 .

It is a cyclic number.

It is not a de Polignac number, because 38938181 - 2⁶ = 38938117 is a prime.

It is a super-2 number, since 2×38938181² = 3032363879177522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (38938187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19469090 + 19469091.

It is an arithmetic number, because the mean of its divisors is an integer number (19469091).

Almost surely, 2^38938181 is an apocalyptic number.

It is an amenable number.

38938181 is a deficient number, since it is larger than the sum of its proper divisors (1).

38938181 is an equidigital number, since it uses as much as digits as its factorization.

38938181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 38938181 is about 6240.0465543135. The cubic root of 38938181 is about 338.9418689463.

The spelling of 38938181 in words is "thirty-eight million, nine hundred thirty-eight thousand, one hundred eighty-one".