39538921 has 2 divisors, whose sum is σ = 39538922. Its totient is φ = 39538920.

The previous prime is 39538913. The next prime is 39538949. The reversal of 39538921 is 12983593.

39538921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29041321 + 10497600 = 5389^2 + 3240^2 .

It is a cyclic number.

It is not a de Polignac number, because 39538921 - 2³ = 39538913 is a prime.

It is not a weakly prime, because it can be changed into another prime (39538951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19769460 + 19769461.

It is an arithmetic number, because the mean of its divisors is an integer number (19769461).

Almost surely, 2^39538921 is an apocalyptic number.

It is an amenable number.

39538921 is a deficient number, since it is larger than the sum of its proper divisors (1).

39538921 is an equidigital number, since it uses as much as digits as its factorization.

39538921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 39538921 is about 6287.9981711193. The cubic root of 39538921 is about 340.6760510527.

The spelling of 39538921 in words is "thirty-nine million, five hundred thirty-eight thousand, nine hundred twenty-one".