39988685 has 24 divisors (see below), whose sum is σ = 53207448. Its totient is φ = 28828800.

The previous prime is 39988661. The next prime is 39988703. The reversal of 39988685 is 58688993.

39988685 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 4 ways, for example, as 813604 + 39175081 = 902^2 + 6259^2 .

It is not a de Polignac number, because 39988685 - 2¹⁴ = 39972301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39988685.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 94775 + ... + 95195.

It is an arithmetic number, because the mean of its divisors is an integer number (2216977).

Almost surely, 2^39988685 is an apocalyptic number.

It is an amenable number.

39988685 is a deficient number, since it is larger than the sum of its proper divisors (13218763).

39988685 is a wasteful number, since it uses less digits than its factorization.

39988685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605 (or 594 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 56.

The square root of 39988685 is about 6323.6607277747. The cubic root of 39988685 is about 341.9629389978.

The spelling of 39988685 in words is "thirty-nine million, nine hundred eighty-eight thousand, six hundred eighty-five".