442409969 has 2 divisors, whose sum is σ = 442409970. Its totient is φ = 442409968.

The previous prime is 442409953. The next prime is 442409971. The reversal of 442409969 is 969904244.

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., 227406400 + 215003569 = 15080^2 + 14663^2 .

It is a cyclic number.

It is not a de Polignac number, because 442409969 - 2⁴ = 442409953 is a prime.

It is a super-2 number, since 2×442409969² = 391453161341161922, which contains 22 as substring.

Together with 442409971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (442499969) 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, 221204984 + 221204985.

It is an arithmetic number, because the mean of its divisors is an integer number (221204985).

Almost surely, 2^442409969 is an apocalyptic number.

It is an amenable number.

442409969 is a deficient number, since it is larger than the sum of its proper divisors (1).

442409969 is an equidigital number, since it uses as much as digits as its factorization.

442409969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 442409969 is about 21033.5439001610. The cubic root of 442409969 is about 761.9766005495.

The spelling of 442409969 in words is "four hundred forty-two million, four hundred nine thousand, nine hundred sixty-nine".