442442309 has 4 divisors (see below), whose sum is σ = 442872480. Its totient is φ = 442012140.

The previous prime is 442442293. The next prime is 442442359. The reversal of 442442309 is 903244244.

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 not a de Polignac number, because 442442309 - 2⁴ = 442442293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442442359) 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, 213539 + ... + 215600.

It is an arithmetic number, because the mean of its divisors is an integer number (110718120).

Almost surely, 2^442442309 is an apocalyptic number.

It is an amenable number.

442442309 is a deficient number, since it is larger than the sum of its proper divisors (430171).

442442309 is a wasteful number, since it uses less digits than its factorization.

442442309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430170.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 442442309 is about 21034.3126581308. The cubic root of 442442309 is about 761.9951668300.

The spelling of 442442309 in words is "four hundred forty-two million, four hundred forty-two thousand, three hundred nine".