39968081 has 2 divisors, whose sum is σ = 39968082. Its totient is φ = 39968080.

The previous prime is 39968063. The next prime is 39968099. The reversal of 39968081 is 18086993.

39968081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (39968063) and next prime (39968099).

It can be written as a sum of positive squares in only one way, i.e., 39627025 + 341056 = 6295^2 + 584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39968081 is a prime.

It is a super-2 number, since 2×39968081² = 3194894997645122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39968041) 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, 19984040 + 19984041.

It is an arithmetic number, because the mean of its divisors is an integer number (19984041).

Almost surely, 2^39968081 is an apocalyptic number.

It is an amenable number.

39968081 is a deficient number, since it is larger than the sum of its proper divisors (1).

39968081 is an equidigital number, since it uses as much as digits as its factorization.

39968081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 39968081 is about 6322.0313982137. The cubic root of 39968081 is about 341.9041972575.

The spelling of 39968081 in words is "thirty-nine million, nine hundred sixty-eight thousand, eighty-one".