39221993 has 2 divisors, whose sum is σ = 39221994. Its totient is φ = 39221992.

The previous prime is 39221989. The next prime is 39222011. The reversal of 39221993 is 39912293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37295449 + 1926544 = 6107^2 + 1388^2 .

It is a cyclic number.

It is not a de Polignac number, because 39221993 - 2² = 39221989 is a prime.

It is not a weakly prime, because it can be changed into another prime (39221933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19610996 + 19610997.

It is an arithmetic number, because the mean of its divisors is an integer number (19610997).

Almost surely, 2^39221993 is an apocalyptic number.

It is an amenable number.

39221993 is a deficient number, since it is larger than the sum of its proper divisors (1).

39221993 is an equidigital number, since it uses as much as digits as its factorization.

39221993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 38.

The square root of 39221993 is about 6262.7464422568. The cubic root of 39221993 is about 339.7633676427.

The spelling of 39221993 in words is "thirty-nine million, two hundred twenty-one thousand, nine hundred ninety-three".