39329681 has 2 divisors, whose sum is σ = 39329682. Its totient is φ = 39329680.

The previous prime is 39329659. The next prime is 39329711. The reversal of 39329681 is 18692393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22886656 + 16443025 = 4784^2 + 4055^2 .

It is an emirp because it is prime and its reverse (18692393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39329681 - 2¹⁴ = 39313297 is a prime.

It is a super-2 number, since 2×39329681² = 3093647615123522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (39329651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19664840 + 19664841.

It is an arithmetic number, because the mean of its divisors is an integer number (19664841).

Almost surely, 2^39329681 is an apocalyptic number.

It is an amenable number.

39329681 is a deficient number, since it is larger than the sum of its proper divisors (1).

39329681 is an equidigital number, since it uses as much as digits as its factorization.

39329681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 39329681 is about 6271.3380549927. The cubic root of 39329681 is about 340.0740352040.

The spelling of 39329681 in words is "thirty-nine million, three hundred twenty-nine thousand, six hundred eighty-one".