42244009 has 2 divisors, whose sum is σ = 42244010.
Its totient is φ = 42244008.
The previous prime is 42244003. The next prime is 42244057. The reversal of 42244009 is 90044224.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 35664784 + 6579225 = 5972^2 + 2565^2
It is a cyclic number.
It is not a de Polignac number, because 42244009 - 23 = 42244001 is a prime.
It is not a weakly prime, because it can be changed into another prime (42244001) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21122004 + 21122005.
It is an arithmetic number, because the mean of its divisors is an integer number (21122005).
Almost surely, 242244009 is an apocalyptic number.
It is an amenable number.
42244009 is a deficient number, since it is larger than the sum of its proper divisors (1).
42244009 is an equidigital number, since it uses as much as digits as its factorization.
42244009 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 2304, while the sum is 25.
The square root of 42244009 is about 6499.5391375081.
The cubic root of 42244009 is about 348.2745251993.
The spelling of 42244009 in words is "forty-two million, two hundred forty-four thousand, nine".