409840853 has 2 divisors, whose sum is σ = 409840854. Its totient is φ = 409840852.

The previous prime is 409840831. The next prime is 409840877. The reversal of 409840853 is 358048904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251634769 + 158206084 = 15863^2 + 12578^2 .

It is a cyclic number.

It is not a de Polignac number, because 409840853 - 2⁸ = 409840597 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 409840853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409840813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204920426 + 204920427.

It is an arithmetic number, because the mean of its divisors is an integer number (204920427).

Almost surely, 2^409840853 is an apocalyptic number.

It is an amenable number.

409840853 is a deficient number, since it is larger than the sum of its proper divisors (1).

409840853 is an equidigital number, since it uses as much as digits as its factorization.

409840853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 409840853 is about 20244.5264948331. The cubic root of 409840853 is about 742.7997500373.

The spelling of 409840853 in words is "four hundred nine million, eight hundred forty thousand, eight hundred fifty-three".