442490401 has 4 divisors (see below), whose sum is σ = 449744404. Its totient is φ = 435236400.

The previous prime is 442490387. The next prime is 442490423. The reversal of 442490401 is 104094244.

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 122080401 + 320410000 = 11049^2 + 17900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442490401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 442490401.

It is not an unprimeable number, because it can be changed into a prime (442490441) 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 in 3 ways as a sum of consecutive naturals, for example, 3626910 + ... + 3627031.

It is an arithmetic number, because the mean of its divisors is an integer number (112436101).

Almost surely, 2^442490401 is an apocalyptic number.

It is an amenable number.

442490401 is a deficient number, since it is larger than the sum of its proper divisors (7254003).

442490401 is an equidigital number, since it uses as much as digits as its factorization.

442490401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7254002.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 442490401 is about 21035.4558068039. The cubic root of 442490401 is about 762.0227746056.

The spelling of 442490401 in words is "four hundred forty-two million, four hundred ninety thousand, four hundred one".