39641639 has 2 divisors, whose sum is σ = 39641640. Its totient is φ = 39641638.

The previous prime is 39641617. The next prime is 39641677. The reversal of 39641639 is 93614693.

39641639 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39641639 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 39641596 and 39641605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39641939) 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, 19820819 + 19820820.

It is an arithmetic number, because the mean of its divisors is an integer number (19820820).

Almost surely, 2^39641639 is an apocalyptic number.

39641639 is a deficient number, since it is larger than the sum of its proper divisors (1).

39641639 is an equidigital number, since it uses as much as digits as its factorization.

39641639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 41.

The square root of 39641639 is about 6296.1606555106. The cubic root of 39641639 is about 340.9708095858.

The spelling of 39641639 in words is "thirty-nine million, six hundred forty-one thousand, six hundred thirty-nine".