39985671 has 16 divisors (see below), whose sum is σ = 61223040. Its totient is φ = 22957920.

The previous prime is 39985643. The next prime is 39985697. The reversal of 39985671 is 17658993.

It is not a de Polignac number, because 39985671 - 2⁵ = 39985639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39985671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39985601) 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, 31260 + ... + 32513.

It is an arithmetic number, because the mean of its divisors is an integer number (3826440).

Almost surely, 2^39985671 is an apocalyptic number.

39985671 is a deficient number, since it is larger than the sum of its proper divisors (21237369).

39985671 is a wasteful number, since it uses less digits than its factorization.

39985671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63806.

The product of its digits is 408240, while the sum is 48.

The square root of 39985671 is about 6323.4224119538. The cubic root of 39985671 is about 341.9543473825.

It can be divided in two parts, 3998 and 5671, that added together give a palindrome (9669).

The spelling of 39985671 in words is "thirty-nine million, nine hundred eighty-five thousand, six hundred seventy-one".