442403993 has 2 divisors, whose sum is σ = 442403994. Its totient is φ = 442403992.

The previous prime is 442403987. The next prime is 442404013. The reversal of 442403993 is 399304244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 283316224 + 159087769 = 16832^2 + 12613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442403993 is a prime.

It is not a weakly prime, because it can be changed into another prime (442403693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221201996 + 221201997.

It is an arithmetic number, because the mean of its divisors is an integer number (221201997).

Almost surely, 2^442403993 is an apocalyptic number.

It is an amenable number.

442403993 is a deficient number, since it is larger than the sum of its proper divisors (1).

442403993 is an equidigital number, since it uses as much as digits as its factorization.

442403993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 442403993 is about 21033.4018408816. The cubic root of 442403993 is about 761.9731696498.

The spelling of 442403993 in words is "four hundred forty-two million, four hundred three thousand, nine hundred ninety-three".