442755981 has 12 divisors (see below), whose sum is σ = 660167040. Its totient is φ = 285648840.

The previous prime is 442755967. The next prime is 442755983. The reversal of 442755981 is 189557244.

It is not a de Polignac number, because 442755981 - 2¹⁴ = 442739597 is a prime.

It is a super-2 number, since 2×442755981² = 392065717422544722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442755983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 793191 + ... + 793748.

It is an arithmetic number, because the mean of its divisors is an integer number (55013920).

Almost surely, 2^442755981 is an apocalyptic number.

It is an amenable number.

442755981 is a deficient number, since it is larger than the sum of its proper divisors (217411059).

442755981 is a wasteful number, since it uses less digits than its factorization.

442755981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586976 (or 1586973 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 442755981 is about 21041.7675350718. The cubic root of 442755981 is about 762.1751978995.

The spelling of 442755981 in words is "four hundred forty-two million, seven hundred fifty-five thousand, nine hundred eighty-one".