442040521 has 4 divisors (see below), whose sum is σ = 476043652. Its totient is φ = 408037392.

The previous prime is 442040503. The next prime is 442040527. The reversal of 442040521 is 125040244.

It is a happy number.

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 108576400 + 333464121 = 10420^2 + 18261^2 .

It is a cyclic number.

It is not a de Polignac number, because 442040521 - 2⁹ = 442040009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 442040492 and 442040501.

It is not an unprimeable number, because it can be changed into a prime (442040527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17001546 + ... + 17001571.

It is an arithmetic number, because the mean of its divisors is an integer number (119010913).

Almost surely, 2^442040521 is an apocalyptic number.

It is an amenable number.

442040521 is a deficient number, since it is larger than the sum of its proper divisors (34003131).

442040521 is a wasteful number, since it uses less digits than its factorization.

442040521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34003130.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 442040521 is about 21024.7597132524. The cubic root of 442040521 is about 761.7644375117.

Adding to 442040521 its reverse (125040244), we get a palindrome (567080765).

The spelling of 442040521 in words is "four hundred forty-two million, forty thousand, five hundred twenty-one".