442705397 has 2 divisors, whose sum is σ = 442705398. Its totient is φ = 442705396.

The previous prime is 442705349. The next prime is 442705423. The reversal of 442705397 is 793507244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388917841 + 53787556 = 19721^2 + 7334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442705397 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 (442705337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221352698 + 221352699.

It is an arithmetic number, because the mean of its divisors is an integer number (221352699).

Almost surely, 2^442705397 is an apocalyptic number.

It is an amenable number.

442705397 is a deficient number, since it is larger than the sum of its proper divisors (1).

442705397 is an equidigital number, since it uses as much as digits as its factorization.

442705397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 442705397 is about 21040.5655104610. The cubic root of 442705397 is about 762.1461711216.

The spelling of 442705397 in words is "four hundred forty-two million, seven hundred five thousand, three hundred ninety-seven".