442801721 has 4 divisors (see below), whose sum is σ = 448867572. Its totient is φ = 436735872.

The previous prime is 442801717. The next prime is 442801741. The reversal of 442801721 is 127108244.

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 96432400 + 346369321 = 9820^2 + 18611^2 .

It is a cyclic number.

It is not a de Polignac number, because 442801721 - 2² = 442801717 is a prime.

It is a super-3 number, since 3×442801721³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442801741) 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, 3032816 + ... + 3032961.

It is an arithmetic number, because the mean of its divisors is an integer number (112216893).

Almost surely, 2^442801721 is an apocalyptic number.

It is an amenable number.

442801721 is a deficient number, since it is larger than the sum of its proper divisors (6065851).

442801721 is an equidigital number, since it uses as much as digits as its factorization.

442801721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6065850.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 442801721 is about 21042.8543928812. The cubic root of 442801721 is about 762.2014431261.

Adding to 442801721 its reverse (127108244), we get a palindrome (569909965).

The spelling of 442801721 in words is "four hundred forty-two million, eight hundred one thousand, seven hundred twenty-one".