39485821 has 2 divisors, whose sum is σ = 39485822. Its totient is φ = 39485820.

The previous prime is 39485807. The next prime is 39485833. The reversal of 39485821 is 12858493.

39485821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22221796 + 17264025 = 4714^2 + 4155^2 .

It is an emirp because it is prime and its reverse (12858493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39485821 - 2¹⁵ = 39453053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39485801) 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, 19742910 + 19742911.

It is an arithmetic number, because the mean of its divisors is an integer number (19742911).

Almost surely, 2^39485821 is an apocalyptic number.

It is an amenable number.

39485821 is a deficient number, since it is larger than the sum of its proper divisors (1).

39485821 is an equidigital number, since it uses as much as digits as its factorization.

39485821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 39485821 is about 6283.7744230677. The cubic root of 39485821 is about 340.5234756323.

The spelling of 39485821 in words is "thirty-nine million, four hundred eighty-five thousand, eight hundred twenty-one".