442516421 has 8 divisors (see below), whose sum is σ = 452753280. Its totient is φ = 432313888.

The previous prime is 442516391. The next prime is 442516429. The reversal of 442516421 is 124615244.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 442516421 - 2⁶ = 442516357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442516429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18470 + ... + 35016.

It is an arithmetic number, because the mean of its divisors is an integer number (56594160).

Almost surely, 2^442516421 is an apocalyptic number.

It is an amenable number.

442516421 is a deficient number, since it is larger than the sum of its proper divisors (10236859).

442516421 is a wasteful number, since it uses less digits than its factorization.

442516421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17163.

The product of its digits is 7680, while the sum is 29.

The square root of 442516421 is about 21036.0742772980. The cubic root of 442516421 is about 762.0377108573.

The spelling of 442516421 in words is "four hundred forty-two million, five hundred sixteen thousand, four hundred twenty-one".