38168381 has 2 divisors, whose sum is σ = 38168382. Its totient is φ = 38168380.

The previous prime is 38168369. The next prime is 38168387. The reversal of 38168381 is 18386183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 12716356 = 5045^2 + 3566^2 .

It is an emirp because it is prime and its reverse (18386183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38168381 - 2¹⁰ = 38167357 is a prime.

It is a super-2 number, since 2×38168381² = 2913650616322322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38168387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19084190 + 19084191.

It is an arithmetic number, because the mean of its divisors is an integer number (19084191).

Almost surely, 2^38168381 is an apocalyptic number.

It is an amenable number.

38168381 is a deficient number, since it is larger than the sum of its proper divisors (1).

38168381 is an equidigital number, since it uses as much as digits as its factorization.

38168381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 38168381 is about 6178.0564095838. The cubic root of 38168381 is about 336.6933816442.

The spelling of 38168381 in words is "thirty-eight million, one hundred sixty-eight thousand, three hundred eighty-one".