442423409 has 2 divisors, whose sum is σ = 442423410. Its totient is φ = 442423408.

The previous prime is 442423349. The next prime is 442423439. The reversal of 442423409 is 904324244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393030625 + 49392784 = 19825^2 + 7028^2 .

It is a cyclic number.

It is not a de Polignac number, because 442423409 - 2⁸ = 442423153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (442423439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221211704 + 221211705.

It is an arithmetic number, because the mean of its divisors is an integer number (221211705).

Almost surely, 2^442423409 is an apocalyptic number.

It is an amenable number.

442423409 is a deficient number, since it is larger than the sum of its proper divisors (1).

442423409 is an equidigital number, since it uses as much as digits as its factorization.

442423409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 442423409 is about 21033.8633874046. The cubic root of 442423409 is about 761.9843165162.

The spelling of 442423409 in words is "four hundred forty-two million, four hundred twenty-three thousand, four hundred nine".