39938913 has 20 divisors (see below), whose sum is σ = 68185920. Its totient is φ = 22821912.

The previous prime is 39938911. The next prime is 39938923. The reversal of 39938913 is 31983993.

It is not a de Polignac number, because 39938913 - 2¹ = 39938911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39938911) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34653 + ... + 35786.

It is an arithmetic number, because the mean of its divisors is an integer number (3409296).

Almost surely, 2^39938913 is an apocalyptic number.

It is an amenable number.

39938913 is a deficient number, since it is larger than the sum of its proper divisors (28247007).

39938913 is an equidigital number, since it uses as much as digits as its factorization.

39938913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70458 (or 70449 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 39938913 is about 6319.7241237257. The cubic root of 39938913 is about 341.8210051342.

The spelling of 39938913 in words is "thirty-nine million, nine hundred thirty-eight thousand, nine hundred thirteen".