38686931 has 2 divisors, whose sum is σ = 38686932. Its totient is φ = 38686930.

The previous prime is 38686927. The next prime is 38686933. The reversal of 38686931 is 13968683.

It is a strong prime.

It is an emirp because it is prime and its reverse (13968683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38686931 - 2² = 38686927 is a prime.

It is a super-2 number, since 2×38686931² = 2993357260397522, which contains 22 as substring.

Together with 38686933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38686933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19343465 + 19343466.

It is an arithmetic number, because the mean of its divisors is an integer number (19343466).

Almost surely, 2^38686931 is an apocalyptic number.

38686931 is a deficient number, since it is larger than the sum of its proper divisors (1).

38686931 is an equidigital number, since it uses as much as digits as its factorization.

38686931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The square root of 38686931 is about 6219.8819120623. The cubic root of 38686931 is about 338.2112838158.

The spelling of 38686931 in words is "thirty-eight million, six hundred eighty-six thousand, nine hundred thirty-one".