39889891 has 2 divisors, whose sum is σ = 39889892. Its totient is φ = 39889890.

The previous prime is 39889847. The next prime is 39889903. The reversal of 39889891 is 19898893.

39889891 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 is a cyclic number.

It is not a de Polignac number, because 39889891 - 2¹⁵ = 39857123 is a prime.

It is not a weakly prime, because it can be changed into another prime (39889691) 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, 19944945 + 19944946.

It is an arithmetic number, because the mean of its divisors is an integer number (19944946).

Almost surely, 2^39889891 is an apocalyptic number.

39889891 is a deficient number, since it is larger than the sum of its proper divisors (1).

39889891 is an equidigital number, since it uses as much as digits as its factorization.

39889891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 55.

The square root of 39889891 is about 6315.8444407696. The cubic root of 39889891 is about 341.6810947176.

The spelling of 39889891 in words is "thirty-nine million, eight hundred eighty-nine thousand, eight hundred ninety-one".