442012309 has 4 divisors (see below), whose sum is σ = 442211616. Its totient is φ = 441813004.

The previous prime is 442012303. The next prime is 442012327. The reversal of 442012309 is 903210244.

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 442012309 - 2³ = 442012301 is a prime.

It is a super-2 number, since 2×442012309² = 390749762615022962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442012301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96289 + ... + 100774.

It is an arithmetic number, because the mean of its divisors is an integer number (110552904).

Almost surely, 2^442012309 is an apocalyptic number.

It is an amenable number.

442012309 is a deficient number, since it is larger than the sum of its proper divisors (199307).

442012309 is a wasteful number, since it uses less digits than its factorization.

442012309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199306.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 442012309 is about 21024.0887793027. The cubic root of 442012309 is about 761.7482313387.

The spelling of 442012309 in words is "four hundred forty-two million, twelve thousand, three hundred nine".