442233809 has 2 divisors, whose sum is σ = 442233810. Its totient is φ = 442233808.

The previous prime is 442233793. The next prime is 442233821. The reversal of 442233809 is 908332244.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 442050625 + 183184 = 21025^2 + 428^2 .

It is a cyclic number.

It is not a de Polignac number, because 442233809 - 2⁴ = 442233793 is a prime.

It is equal to p_23462990 and since 442233809 and 23462990 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (442233829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221116904 + 221116905.

It is an arithmetic number, because the mean of its divisors is an integer number (221116905).

Almost surely, 2^442233809 is an apocalyptic number.

It is an amenable number.

442233809 is a deficient number, since it is larger than the sum of its proper divisors (1).

442233809 is an equidigital number, since it uses as much as digits as its factorization.

442233809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 442233809 is about 21029.3558864745. The cubic root of 442233809 is about 761.8754518207.

The spelling of 442233809 in words is "four hundred forty-two million, two hundred thirty-three thousand, eight hundred nine".