39009221 has 2 divisors, whose sum is σ = 39009222. Its totient is φ = 39009220.

The previous prime is 39009181. The next prime is 39009227. The reversal of 39009221 is 12290093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38925121 + 84100 = 6239^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 39009221 - 2²² = 34814917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39009227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19504610 + 19504611.

It is an arithmetic number, because the mean of its divisors is an integer number (19504611).

Almost surely, 2^39009221 is an apocalyptic number.

It is an amenable number.

39009221 is a deficient number, since it is larger than the sum of its proper divisors (1).

39009221 is an equidigital number, since it uses as much as digits as its factorization.

39009221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 39009221 is about 6245.7362256182. The cubic root of 39009221 is about 339.1478689993.

The spelling of 39009221 in words is "thirty-nine million, nine thousand, two hundred twenty-one".