39943872 has 84 divisors (see below), whose sum is σ = 118238016. Its totient is φ = 12879360.

The previous prime is 39943807. The next prime is 39943873. The reversal of 39943872 is 27834993.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (39943873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16738 + ... + 18974.

Almost surely, 2^39943872 is an apocalyptic number.

39943872 is a gapful number since it is divisible by the number (32) 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 39943872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59119008).

39943872 is an abundant number, since it is smaller than the sum of its proper divisors (78294144).

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

39943872 is a wasteful number, since it uses less digits than its factorization.

39943872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286 (or 2273 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 39943872 is about 6320.1164546233. The cubic root of 39943872 is about 341.8351519073.

The spelling of 39943872 in words is "thirty-nine million, nine hundred forty-three thousand, eight hundred seventy-two".