39939680 has 72 divisors (see below), whose sum is σ = 103765536. Its totient is φ = 14516480.

The previous prime is 39939677. The next prime is 39939719. The reversal of 39939680 is 8693993.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18329 + ... + 20391.

It is an arithmetic number, because the mean of its divisors is an integer number (1441188).

Almost surely, 2^39939680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39939680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51882768).

39939680 is an abundant number, since it is smaller than the sum of its proper divisors (63825856).

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

39939680 is a wasteful number, since it uses less digits than its factorization.

39939680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100 (or 2081 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 39939680 is about 6319.7848064630. The cubic root of 39939680 is about 341.8231932678.

The spelling of 39939680 in words is "thirty-nine million, nine hundred thirty-nine thousand, six hundred eighty".