39992221 has 2 divisors, whose sum is σ = 39992222. Its totient is φ = 39992220.

The previous prime is 39992129. The next prime is 39992231. The reversal of 39992221 is 12229993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39200121 + 792100 = 6261^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 39992221 - 2¹³ = 39984029 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39992231) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19996110 + 19996111.

It is an arithmetic number, because the mean of its divisors is an integer number (19996111).

Almost surely, 2^39992221 is an apocalyptic number.

It is an amenable number.

39992221 is a deficient number, since it is larger than the sum of its proper divisors (1).

39992221 is an equidigital number, since it uses as much as digits as its factorization.

39992221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 37.

The square root of 39992221 is about 6323.9403064861. The cubic root of 39992221 is about 341.9730180599.

The spelling of 39992221 in words is "thirty-nine million, nine hundred ninety-two thousand, two hundred twenty-one".