840523 has 2 divisors, whose sum is σ = 840524. Its totient is φ = 840522.

The previous prime is 840491. The next prime is 840547. The reversal of 840523 is 325048.

840523 is nontrivially palindromic in base 8.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840523 - 2⁵ = 840491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840494 and 840503.

It is not a weakly prime, because it can be changed into another prime (840023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420261 + 420262.

It is an arithmetic number, because the mean of its divisors is an integer number (420262).

2⁸⁴⁰⁵²³ is an apocalyptic number.

840523 is a deficient number, since it is larger than the sum of its proper divisors (1).

840523 is an equidigital number, since it uses as much as digits as its factorization.

840523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 840523 is about 916.8004144851. The cubic root of 840523 is about 94.3734577179.

The spelling of 840523 in words is "eight hundred forty thousand, five hundred twenty-three".