442343509 has 4 divisors (see below), whose sum is σ = 442458016. Its totient is φ = 442229004.

The previous prime is 442343471. The next prime is 442343533. The reversal of 442343509 is 905343244.

It is a happy number.

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 442343509 - 2⁷ = 442343381 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 (442343609) 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, 51249 + ... + 59254.

It is an arithmetic number, because the mean of its divisors is an integer number (110614504).

Almost surely, 2^442343509 is an apocalyptic number.

It is an amenable number.

442343509 is a deficient number, since it is larger than the sum of its proper divisors (114507).

442343509 is a wasteful number, since it uses less digits than its factorization.

442343509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114506.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 442343509 is about 21031.9639834229. The cubic root of 442343509 is about 761.9384432561.

The spelling of 442343509 in words is "four hundred forty-two million, three hundred forty-three thousand, five hundred nine".