442143905 has 48 divisors (see below), whose sum is σ = 661893120. Its totient is φ = 281691648.

The previous prime is 442143869. The next prime is 442143913. The reversal of 442143905 is 509341244.

It is not a de Polignac number, because 442143905 - 2⁶ = 442143841 is a prime.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 345056 + ... + 346334.

It is an arithmetic number, because the mean of its divisors is an integer number (13789440).

Almost surely, 2^442143905 is an apocalyptic number.

It is an amenable number.

442143905 is a deficient number, since it is larger than the sum of its proper divisors (219749215).

442143905 is a wasteful number, since it uses less digits than its factorization.

442143905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398 (or 1391 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 442143905 is about 21027.2181945211. The cubic root of 442143905 is about 761.8238197870.

The spelling of 442143905 in words is "four hundred forty-two million, one hundred forty-three thousand, nine hundred five".