39091986 has 12 divisors (see below), whose sum is σ = 84699342. Its totient is φ = 13030656.

The previous prime is 39091981. The next prime is 39091999. The reversal of 39091986 is 68919093.

39091986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 38675961 + 416025 = 6219^2 + 645^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39091981) 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 in 5 ways as a sum of consecutive naturals, for example, 1085871 + ... + 1085906.

Almost surely, 2^39091986 is an apocalyptic number.

39091986 is an abundant number, since it is smaller than the sum of its proper divisors (45607356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39091986 is a wasteful number, since it uses less digits than its factorization.

39091986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171785 (or 2171782 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 39091986 is about 6252.3584350227. The cubic root of 39091986 is about 339.3875537413.

The spelling of 39091986 in words is "thirty-nine million, ninety-one thousand, nine hundred eighty-six".