840826853 has 2 divisors, whose sum is σ = 840826854. Its totient is φ = 840826852.

The previous prime is 840826823. The next prime is 840826871. The reversal of 840826853 is 358628048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 818989924 + 21836929 = 28618^2 + 4673^2 .

It is a cyclic number.

It is not a de Polignac number, because 840826853 - 2²² = 836632549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840826823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420413426 + 420413427.

It is an arithmetic number, because the mean of its divisors is an integer number (420413427).

Almost surely, 2^840826853 is an apocalyptic number.

It is an amenable number.

840826853 is a deficient number, since it is larger than the sum of its proper divisors (1).

840826853 is an equidigital number, since it uses as much as digits as its factorization.

840826853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 368640, while the sum is 44.

The square root of 840826853 is about 28997.0145532260. The cubic root of 840826853 is about 943.8482849674.

The spelling of 840826853 in words is "eight hundred forty million, eight hundred twenty-six thousand, eight hundred fifty-three".