39871664 has 80 divisors (see below), whose sum is σ = 95851008. Its totient is φ = 15676416.

The previous prime is 39871661. The next prime is 39871679. The reversal of 39871664 is 46617893.

It is not an unprimeable number, because it can be changed into a prime (39871661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81629 + ... + 82115.

Almost surely, 2^39871664 is an apocalyptic number.

39871664 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39871664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47925504).

39871664 is an abundant number, since it is smaller than the sum of its proper divisors (55979344).

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

39871664 is a wasteful number, since it uses less digits than its factorization.

39871664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562 (or 556 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 39871664 is about 6314.4013176231. The cubic root of 39871664 is about 341.6290450214.

The spelling of 39871664 in words is "thirty-nine million, eight hundred seventy-one thousand, six hundred sixty-four".