442340309 has 4 divisors (see below), whose sum is σ = 442547916. Its totient is φ = 442132704.

The previous prime is 442340303. The next prime is 442340321. The reversal of 442340309 is 903043244.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9284209 + 433056100 = 3047^2 + 20810^2 .

It is a cyclic number.

It is not a de Polignac number, because 442340309 - 2⁸ = 442340053 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 (442340303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100574 + ... + 104879.

It is an arithmetic number, because the mean of its divisors is an integer number (110636979).

Almost surely, 2^442340309 is an apocalyptic number.

It is an amenable number.

442340309 is a deficient number, since it is larger than the sum of its proper divisors (207607).

442340309 is a wasteful number, since it uses less digits than its factorization.

442340309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207606.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 442340309 is about 21031.8879086020. The cubic root of 442340309 is about 761.9366059142.

The spelling of 442340309 in words is "four hundred forty-two million, three hundred forty thousand, three hundred nine".