442404665 has 4 divisors (see below), whose sum is σ = 530885604. Its totient is φ = 353923728.

The previous prime is 442404659. The next prime is 442404679. The reversal of 442404665 is 566404244.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 266603584 + 175801081 = 16328^2 + 13259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442404665 is a prime.

It is a super-2 number, since 2×442404665² = 391443775227524450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 44240462 + ... + 44240471.

It is an arithmetic number, because the mean of its divisors is an integer number (132721401).

Almost surely, 2^442404665 is an apocalyptic number.

It is an amenable number.

442404665 is a deficient number, since it is larger than the sum of its proper divisors (88480939).

442404665 is an equidigital number, since it uses as much as digits as its factorization.

442404665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88480938.

The product of its (nonzero) digits is 92160, while the sum is 35.

The square root of 442404665 is about 21033.4178154669. The cubic root of 442404665 is about 761.9735554553.

The spelling of 442404665 in words is "four hundred forty-two million, four hundred four thousand, six hundred sixty-five".