39891941 has 2 divisors, whose sum is σ = 39891942. Its totient is φ = 39891940.

The previous prime is 39891923. The next prime is 39891949. The reversal of 39891941 is 14919893.

39891941 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31967716 + 7924225 = 5654^2 + 2815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39891941 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 39891892 and 39891901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39891949) 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, 19945970 + 19945971.

It is an arithmetic number, because the mean of its divisors is an integer number (19945971).

Almost surely, 2^39891941 is an apocalyptic number.

It is an amenable number.

39891941 is a deficient number, since it is larger than the sum of its proper divisors (1).

39891941 is an equidigital number, since it uses as much as digits as its factorization.

39891941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 39891941 is about 6316.0067289388. The cubic root of 39891941 is about 341.6869477815.

The spelling of 39891941 in words is "thirty-nine million, eight hundred ninety-one thousand, nine hundred forty-one".