39688390 has 16 divisors (see below), whose sum is σ = 81644832. Its totient is φ = 13607424.

The previous prime is 39688379. The next prime is 39688391. The reversal of 39688390 is 9388693.

39688390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 39688390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39688391) 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 7 ways as a sum of consecutive naturals, for example, 283419 + ... + 283558.

It is an arithmetic number, because the mean of its divisors is an integer number (5102802).

Almost surely, 2^39688390 is an apocalyptic number.

39688390 is an abundant number, since it is smaller than the sum of its proper divisors (41956442).

39688390 is a wasteful number, since it uses less digits than its factorization.

39688390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566991.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 39688390 is about 6299.8722209264. The cubic root of 39688390 is about 341.1047971833.

The spelling of 39688390 in words is "thirty-nine million, six hundred eighty-eight thousand, three hundred ninety".