442302521 has 4 divisors (see below), whose sum is σ = 449553444. Its totient is φ = 435051600.

The previous prime is 442302479. The next prime is 442302541. The reversal of 442302521 is 125203244.

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 40500496 + 401802025 = 6364^2 + 20045^2 .

It is a cyclic number.

It is not a de Polignac number, because 442302521 - 2⁶ = 442302457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442302541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3625370 + ... + 3625491.

It is an arithmetic number, because the mean of its divisors is an integer number (112388361).

Almost surely, 2^442302521 is an apocalyptic number.

It is an amenable number.

442302521 is a deficient number, since it is larger than the sum of its proper divisors (7250923).

442302521 is an equidigital number, since it uses as much as digits as its factorization.

442302521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7250922.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 442302521 is about 21030.9895392490. The cubic root of 442302521 is about 761.9149085318.

Adding to 442302521 its reverse (125203244), we get a palindrome (567505765).

The spelling of 442302521 in words is "four hundred forty-two million, three hundred two thousand, five hundred twenty-one".