39869881 has 2 divisors, whose sum is σ = 39869882. Its totient is φ = 39869880.

The previous prime is 39869861. The next prime is 39869887. The reversal of 39869881 is 18896893.

39869881 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., 26873856 + 12996025 = 5184^2 + 3605^2 .

It is a cyclic number.

It is not a de Polignac number, because 39869881 - 2¹⁵ = 39837113 is a prime.

It is a super-2 number, since 2×39869881² = 3179214821908322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39869887) 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, 19934940 + 19934941.

It is an arithmetic number, because the mean of its divisors is an integer number (19934941).

Almost surely, 2^39869881 is an apocalyptic number.

It is an amenable number.

39869881 is a deficient number, since it is larger than the sum of its proper divisors (1).

39869881 is an equidigital number, since it uses as much as digits as its factorization.

39869881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 52.

The square root of 39869881 is about 6314.2601308467. The cubic root of 39869881 is about 341.6239525689.

The spelling of 39869881 in words is "thirty-nine million, eight hundred sixty-nine thousand, eight hundred eighty-one".