38164221 has 6 divisors (see below), whose sum is σ = 55126110. Its totient is φ = 25442808.

The previous prime is 38164211. The next prime is 38164253. The reversal of 38164221 is 12246183.

38164221 is a `hidden beast` number, since 381 + 64 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 37380996 + 783225 = 6114^2 + 885^2 .

It is not a de Polignac number, because 38164221 - 2¹⁰ = 38163197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38164211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2120226 + ... + 2120243.

It is an arithmetic number, because the mean of its divisors is an integer number (9187685).

Almost surely, 2^38164221 is an apocalyptic number.

It is an amenable number.

38164221 is a deficient number, since it is larger than the sum of its proper divisors (16961889).

38164221 is a wasteful number, since it uses less digits than its factorization.

38164221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4240475 (or 4240472 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 38164221 is about 6177.7197249471. The cubic root of 38164221 is about 336.6811490464.

The spelling of 38164221 in words is "thirty-eight million, one hundred sixty-four thousand, two hundred twenty-one".