38939221 has 2 divisors, whose sum is σ = 38939222. Its totient is φ = 38939220.

The previous prime is 38939203. The next prime is 38939249. The reversal of 38939221 is 12293983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27447121 + 11492100 = 5239^2 + 3390^2 .

It is a cyclic number.

It is not a de Polignac number, because 38939221 - 2⁹ = 38938709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38939291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19469610 + 19469611.

It is an arithmetic number, because the mean of its divisors is an integer number (19469611).

Almost surely, 2^38939221 is an apocalyptic number.

It is an amenable number.

38939221 is a deficient number, since it is larger than the sum of its proper divisors (1).

38939221 is an equidigital number, since it uses as much as digits as its factorization.

38939221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 37.

The square root of 38939221 is about 6240.1298864687. The cubic root of 38939221 is about 338.9448865192.

The spelling of 38939221 in words is "thirty-eight million, nine hundred thirty-nine thousand, two hundred twenty-one".