38005821 has 48 divisors (see below), whose sum is σ = 68400000. Its totient is φ = 20756736.

The previous prime is 38005819. The next prime is 38005843. The reversal of 38005821 is 12850083.

It is a happy number.

38005821 is a `hidden beast` number, since 3 + 80 + 0 + 582 + 1 = 666.

It is not a de Polignac number, because 38005821 - 2¹ = 38005819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38000821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29805 + ... + 31053.

It is an arithmetic number, because the mean of its divisors is an integer number (1425000).

Almost surely, 2^38005821 is an apocalyptic number.

It is an amenable number.

38005821 is a deficient number, since it is larger than the sum of its proper divisors (30394179).

38005821 is a wasteful number, since it uses less digits than its factorization.

38005821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295 (or 1282 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 38005821 is about 6164.8861303353. The cubic root of 38005821 is about 336.2147065217.

The spelling of 38005821 in words is "thirty-eight million, five thousand, eight hundred twenty-one".