39493821 has 16 divisors (see below), whose sum is σ = 53785728. Its totient is φ = 25771200.

The previous prime is 39493793. The next prime is 39493843. The reversal of 39493821 is 12839493.

39493821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 39493821 - 2⁵ = 39493789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39493821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39493891) 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 in 15 ways as a sum of consecutive naturals, for example, 32851 + ... + 34031.

It is an arithmetic number, because the mean of its divisors is an integer number (3361608).

Almost surely, 2^39493821 is an apocalyptic number.

It is an amenable number.

39493821 is a deficient number, since it is larger than the sum of its proper divisors (14291907).

39493821 is a wasteful number, since it uses less digits than its factorization.

39493821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412.

The product of its digits is 46656, while the sum is 39.

The square root of 39493821 is about 6284.4109509166. The cubic root of 39493821 is about 340.5464712611.

The spelling of 39493821 in words is "thirty-nine million, four hundred ninety-three thousand, eight hundred twenty-one".