442143997 has 2 divisors, whose sum is σ = 442143998. Its totient is φ = 442143996.

The previous prime is 442143983. The next prime is 442144033. The reversal of 442143997 is 799341244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278022276 + 164121721 = 16674^2 + 12811^2 .

It is a cyclic number.

It is not a de Polignac number, because 442143997 - 2⁷ = 442143869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442143937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221071998 + 221071999.

It is an arithmetic number, because the mean of its divisors is an integer number (221071999).

Almost surely, 2^442143997 is an apocalyptic number.

It is an amenable number.

442143997 is a deficient number, since it is larger than the sum of its proper divisors (1).

442143997 is an equidigital number, since it uses as much as digits as its factorization.

442143997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The square root of 442143997 is about 21027.2203821618. The cubic root of 442143997 is about 761.8238726264.

The spelling of 442143997 in words is "four hundred forty-two million, one hundred forty-three thousand, nine hundred ninety-seven".