38675821 has 4 divisors (see below), whose sum is σ = 40009500. Its totient is φ = 37342144.

The previous prime is 38675809. The next prime is 38675827. The reversal of 38675821 is 12857683.

38675821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12857683 = 373 ⋅34471.

It can be written as a sum of positive squares in 2 ways, for example, as 16491721 + 22184100 = 4061^2 + 4710^2 .

It is a cyclic number.

It is not a de Polignac number, because 38675821 - 2⁹ = 38675309 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38675827) 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 3 ways as a sum of consecutive naturals, for example, 666796 + ... + 666853.

It is an arithmetic number, because the mean of its divisors is an integer number (10002375).

Almost surely, 2^38675821 is an apocalyptic number.

It is an amenable number.

38675821 is a deficient number, since it is larger than the sum of its proper divisors (1333679).

38675821 is a wasteful number, since it uses less digits than its factorization.

38675821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333678.

The product of its digits is 80640, while the sum is 40.

The square root of 38675821 is about 6218.9887441609. The cubic root of 38675821 is about 338.1789052061.

The spelling of 38675821 in words is "thirty-eight million, six hundred seventy-five thousand, eight hundred twenty-one".