40709 has 2 divisors, whose sum is σ = 40710. Its totient is φ = 40708.
The previous prime is 40699. The next prime is 40739. The reversal of 40709 is 90704.
40709 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., 31684 + 9025 = 178^2 + 95^2 .
It is a cyclic number.
It is not a de Polignac number, because 40709 - 24 = 40693 is a prime.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (40739) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20354 + 20355.
It is an arithmetic number, because the mean of its divisors is an integer number (20355).
240709 is an apocalyptic number.
It is an amenable number.
40709 is a deficient number, since it is larger than the sum of its proper divisors (1).
40709 is an equidigital number, since it uses as much as digits as its factorization.
40709 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 252, while the sum is 20.
The square root of 40709 is about 201.7647144572. The cubic root of 40709 is about 34.4003988596.
The spelling of 40709 in words is "forty thousand, seven hundred nine".
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