39685872 has 40 divisors (see below), whose sum is σ = 103493376. Its totient is φ = 13103296.

The previous prime is 39685853. The next prime is 39685873. The reversal of 39685872 is 27858693.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39685873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1273 + ... + 8999.

Almost surely, 2^39685872 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 39685872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51746688).

39685872 is an abundant number, since it is smaller than the sum of its proper divisors (63807504).

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

39685872 is a wasteful number, since it uses less digits than its factorization.

39685872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7845 (or 7839 counting only the distinct ones).

The product of its digits is 725760, while the sum is 48.

The square root of 39685872 is about 6299.6723724333. The cubic root of 39685872 is about 341.0975833184.

It can be divided in two parts, 396 and 85872, that added together give a palindrome (86268).

The spelling of 39685872 in words is "thirty-nine million, six hundred eighty-five thousand, eight hundred seventy-two".