40609 has 2 divisors, whose sum is σ = 40610.
Its totient is φ = 40608.
The previous prime is 40597. The next prime is 40627. The reversal of 40609 is 90604.
It is a happy number.
40609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 29584 + 11025 = 172^2 + 105^2
It is a cyclic number.
It is not a de Polignac number, because 40609 - 25 = 40577 is a prime.
It is a Chen prime.
It is an Ulam number.
40609 is a lucky number.
It is not a weakly prime, because it can be changed into another prime (40639) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20304 + 20305.
It is an arithmetic number, because the mean of its divisors is an integer number (20305).
240609 is an apocalyptic number.
It is an amenable number.
40609 is a deficient number, since it is larger than the sum of its proper divisors (1).
40609 is an equidigital number, since it uses as much as digits as its factorization.
40609 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 216, while the sum is 19.
The square root of 40609 is about 201.5167486836.
The cubic root of 40609 is about 34.3722080377.
The spelling of 40609 in words is "forty thousand, six hundred nine".