38221665 has 8 divisors (see below), whose sum is σ = 61154688. Its totient is φ = 20384880.

The previous prime is 38221663. The next prime is 38221679. The reversal of 38221665 is 56612283.

38221665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 38221665 - 2¹ = 38221663 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 1274041 + ... + 1274070.

It is an arithmetic number, because the mean of its divisors is an integer number (7644336).

Almost surely, 2^38221665 is an apocalyptic number.

It is an amenable number.

38221665 is a deficient number, since it is larger than the sum of its proper divisors (22933023).

38221665 is a wasteful number, since it uses less digits than its factorization.

38221665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548119.

The product of its digits is 17280, while the sum is 33.

The square root of 38221665 is about 6182.3672650531. The cubic root of 38221665 is about 336.8499862101.

The spelling of 38221665 in words is "thirty-eight million, two hundred twenty-one thousand, six hundred sixty-five".