39242221 has 2 divisors, whose sum is σ = 39242222. Its totient is φ = 39242220.

The previous prime is 39242173. The next prime is 39242233. The reversal of 39242221 is 12224293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37515625 + 1726596 = 6125^2 + 1314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39242221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39242251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19621110 + 19621111.

It is an arithmetic number, because the mean of its divisors is an integer number (19621111).

Almost surely, 2^39242221 is an apocalyptic number.

It is an amenable number.

39242221 is a deficient number, since it is larger than the sum of its proper divisors (1).

39242221 is an equidigital number, since it uses as much as digits as its factorization.

39242221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 39242221 is about 6264.3611805195. The cubic root of 39242221 is about 339.8217664450.

The spelling of 39242221 in words is "thirty-nine million, two hundred forty-two thousand, two hundred twenty-one".