442533213 has 20 divisors (see below), whose sum is σ = 677196828. Its totient is φ = 287824320.

The previous prime is 442533211. The next prime is 442533257. The reversal of 442533213 is 312335244.

442533213 is a `hidden beast` number, since 442 + 5 + 3 + 3 + 213 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 213101604 + 229431609 = 14598^2 + 15147^2 .

It is not a de Polignac number, because 442533213 - 2¹ = 442533211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442533211) 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 19 ways as a sum of consecutive naturals, for example, 63306 + ... + 69947.

Almost surely, 2^442533213 is an apocalyptic number.

It is an amenable number.

442533213 is a deficient number, since it is larger than the sum of its proper divisors (234663615).

442533213 is a wasteful number, since it uses less digits than its factorization.

442533213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133306 (or 133297 counting only the distinct ones).

The product of its digits is 8640, while the sum is 27.

The square root of 442533213 is about 21036.4733974115. The cubic root of 442533213 is about 762.0473496524.

Adding to 442533213 its reverse (312335244), we get a palindrome (754868457).

The spelling of 442533213 in words is "four hundred forty-two million, five hundred thirty-three thousand, two hundred thirteen".