442804819 has 2 divisors, whose sum is σ = 442804820. Its totient is φ = 442804818.

The previous prime is 442804807. The next prime is 442804829. The reversal of 442804819 is 918408244.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 442804819 - 2¹⁵ = 442772051 is a prime.

It is a super-2 number, since 2×442804819² = 392152215459245522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (442804829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221402409 + 221402410.

It is an arithmetic number, because the mean of its divisors is an integer number (221402410).

Almost surely, 2^442804819 is an apocalyptic number.

442804819 is a deficient number, since it is larger than the sum of its proper divisors (1).

442804819 is an equidigital number, since it uses as much as digits as its factorization.

442804819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 442804819 is about 21042.9280044389. The cubic root of 442804819 is about 762.2032206670.

The spelling of 442804819 in words is "four hundred forty-two million, eight hundred four thousand, eight hundred nineteen".