392442221 has 2 divisors, whose sum is σ = 392442222. Its totient is φ = 392442220.

The previous prime is 392442203. The next prime is 392442227. The reversal of 392442221 is 122244293.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376554025 + 15888196 = 19405^2 + 3986^2 .

It is an emirp because it is prime and its reverse (122244293) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-392442221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (392442227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196221110 + 196221111.

It is an arithmetic number, because the mean of its divisors is an integer number (196221111).

Almost surely, 2^392442221 is an apocalyptic number.

It is an amenable number.

392442221 is a deficient number, since it is larger than the sum of its proper divisors (1).

392442221 is an equidigital number, since it uses as much as digits as its factorization.

392442221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 29.

The square root of 392442221 is about 19810.1544920780. The cubic root of 392442221 is about 732.1362463750.

The spelling of 392442221 in words is "three hundred ninety-two million, four hundred forty-two thousand, two hundred twenty-one".