38516381 has 2 divisors, whose sum is σ = 38516382. Its totient is φ = 38516380.

The previous prime is 38516327. The next prime is 38516447. The reversal of 38516381 is 18361583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37100281 + 1416100 = 6091^2 + 1190^2 .

It is a cyclic number.

It is not a de Polignac number, because 38516381 - 2¹⁰ = 38515357 is a prime.

It is a super-2 number, since 2×38516381² = 2967023210674322, which contains 22 as substring.

It is a Chen prime.

It is equal to p_2348693 and since 38516381 and 2348693 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38516311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19258190 + 19258191.

It is an arithmetic number, because the mean of its divisors is an integer number (19258191).

Almost surely, 2^38516381 is an apocalyptic number.

It is an amenable number.

38516381 is a deficient number, since it is larger than the sum of its proper divisors (1).

38516381 is an equidigital number, since it uses as much as digits as its factorization.

38516381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 38516381 is about 6206.1567012121. The cubic root of 38516381 is about 337.7135540992.

The spelling of 38516381 in words is "thirty-eight million, five hundred sixteen thousand, three hundred eighty-one".