442537921 has 8 divisors (see below), whose sum is σ = 506732544. Its totient is φ = 378587040.

The previous prime is 442537913. The next prime is 442537943. The reversal of 442537921 is 129735244.

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 442537921 - 2³ = 442537913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442537961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57025 + ... + 64318.

It is an arithmetic number, because the mean of its divisors is an integer number (63341568).

Almost surely, 2^442537921 is an apocalyptic number.

It is an amenable number.

442537921 is a deficient number, since it is larger than the sum of its proper divisors (64194623).

442537921 is a wasteful number, since it uses less digits than its factorization.

442537921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121871.

The product of its digits is 60480, while the sum is 37.

The square root of 442537921 is about 21036.5852979993. The cubic root of 442537921 is about 762.0500520531.

The spelling of 442537921 in words is "four hundred forty-two million, five hundred thirty-seven thousand, nine hundred twenty-one".