39967381 has 2 divisors, whose sum is σ = 39967382. Its totient is φ = 39967380.

The previous prime is 39967379. The next prime is 39967397. The reversal of 39967381 is 18376993.

39967381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39312900 + 654481 = 6270^2 + 809^2 .

It is a cyclic number.

It is not a de Polignac number, because 39967381 - 2¹ = 39967379 is a prime.

It is a super-2 number, since 2×39967381² = 3194783087998322, which contains 22 as substring.

Together with 39967379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39967981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19983690 + 19983691.

It is an arithmetic number, because the mean of its divisors is an integer number (19983691).

Almost surely, 2^39967381 is an apocalyptic number.

It is an amenable number.

39967381 is a deficient number, since it is larger than the sum of its proper divisors (1).

39967381 is an equidigital number, since it uses as much as digits as its factorization.

39967381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 46.

The square root of 39967381 is about 6321.9760360191. The cubic root of 39967381 is about 341.9022012119.

The spelling of 39967381 in words is "thirty-nine million, nine hundred sixty-seven thousand, three hundred eighty-one".