38221666 has 48 divisors (see below), whose sum is σ = 69866496. Its totient is φ = 15621984.

The previous prime is 38221663. The next prime is 38221679. The reversal of 38221666 is 66612283.

It is a happy number.

38221666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Its product of digits (20736) is a multiple of the sum of its prime divisors (256).

It is not an unprimeable number, because it can be changed into a prime (38221663) 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 23 ways as a sum of consecutive naturals, for example, 300895 + ... + 301021.

It is an arithmetic number, because the mean of its divisors is an integer number (1455552).

Almost surely, 2^38221666 is an apocalyptic number.

38221666 is a deficient number, since it is larger than the sum of its proper divisors (31644830).

38221666 is a wasteful number, since it uses less digits than its factorization.

38221666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 256 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 38221666 is about 6182.3673459283. The cubic root of 38221666 is about 336.8499891478.

The spelling of 38221666 in words is "thirty-eight million, two hundred twenty-one thousand, six hundred sixty-six".