442943309 has 4 divisors (see below), whose sum is σ = 443824416. Its totient is φ = 442062204.

The previous prime is 442943287. The next prime is 442943323. The reversal of 442943309 is 903349244.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442943309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442943329) 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, 439799 + ... + 440804.

It is an arithmetic number, because the mean of its divisors is an integer number (110956104).

Almost surely, 2^442943309 is an apocalyptic number.

It is an amenable number.

442943309 is a deficient number, since it is larger than the sum of its proper divisors (881107).

442943309 is an equidigital number, since it uses as much as digits as its factorization.

442943309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881106.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 442943309 is about 21046.2184014136. The cubic root of 442943309 is about 762.2826736726.

The spelling of 442943309 in words is "four hundred forty-two million, nine hundred forty-three thousand, three hundred nine".