38671821 has 48 divisors (see below), whose sum is σ = 63685440. Its totient is φ = 22464000.

The previous prime is 38671817. The next prime is 38671847. The reversal of 38671821 is 12817683.

38671821 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 38671821 - 2² = 38671817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38671811) 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 47 ways as a sum of consecutive naturals, for example, 153946 + ... + 154196.

It is an arithmetic number, because the mean of its divisors is an integer number (1326780).

Almost surely, 2^38671821 is an apocalyptic number.

It is an amenable number.

38671821 is a deficient number, since it is larger than the sum of its proper divisors (25013619).

38671821 is a wasteful number, since it uses less digits than its factorization.

38671821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 343 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 38671821 is about 6218.6671401515. The cubic root of 38671821 is about 338.1672462228.

The spelling of 38671821 in words is "thirty-eight million, six hundred seventy-one thousand, eight hundred twenty-one".