442143220 has 12 divisors (see below), whose sum is σ = 928500804. Its totient is φ = 176857280.

The previous prime is 442143217. The next prime is 442143223. The reversal of 442143220 is 22341244.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (442143217) and next prime (442143223).

It can be written as a sum of positive squares in 2 ways, for example, as 343657444 + 98485776 = 18538^2 + 9924^2 .

It is a junction number, because it is equal to n+sod(n) for n = 442143191 and 442143200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442143223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11053561 + ... + 11053600.

It is an arithmetic number, because the mean of its divisors is an integer number (77375067).

Almost surely, 2^442143220 is an apocalyptic number.

It is an amenable number.

442143220 is an abundant number, since it is smaller than the sum of its proper divisors (486357584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

442143220 is a wasteful number, since it uses less digits than its factorization.

442143220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22107170 (or 22107168 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 442143220 is about 21027.2019061025. The cubic root of 442143220 is about 761.8234263634.

Adding to 442143220 its reverse (22341244), we get a palindrome (464484464).

The spelling of 442143220 in words is "four hundred forty-two million, one hundred forty-three thousand, two hundred twenty".