38786221 has 2 divisors, whose sum is σ = 38786222. Its totient is φ = 38786220.

The previous prime is 38786219. The next prime is 38786227. The reversal of 38786221 is 12268783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34644996 + 4141225 = 5886^2 + 2035^2 .

It is an emirp because it is prime and its reverse (12268783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38786221 - 2¹ = 38786219 is a prime.

Together with 38786219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38786227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19393110 + 19393111.

It is an arithmetic number, because the mean of its divisors is an integer number (19393111).

Almost surely, 2^38786221 is an apocalyptic number.

It is an amenable number.

38786221 is a deficient number, since it is larger than the sum of its proper divisors (1).

38786221 is an equidigital number, since it uses as much as digits as its factorization.

38786221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 38786221 is about 6227.8584601771. The cubic root of 38786221 is about 338.5003763668.

The spelling of 38786221 in words is "thirty-eight million, seven hundred eighty-six thousand, two hundred twenty-one".