442664143 has 4 divisors (see below), whose sum is σ = 444649408. Its totient is φ = 440678880.

The previous prime is 442664119. The next prime is 442664191. The reversal of 442664143 is 341466244.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442664143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 442664099 and 442664108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442674143) 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, 992298 + ... + 992743.

It is an arithmetic number, because the mean of its divisors is an integer number (111162352).

Almost surely, 2^442664143 is an apocalyptic number.

442664143 is a deficient number, since it is larger than the sum of its proper divisors (1985265).

442664143 is a wasteful number, since it uses less digits than its factorization.

442664143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985264.

The product of its digits is 55296, while the sum is 34.

The square root of 442664143 is about 21039.5851432484. The cubic root of 442664143 is about 762.1224965704.

The spelling of 442664143 in words is "four hundred forty-two million, six hundred sixty-four thousand, one hundred forty-three".