840319 has 2 divisors, whose sum is σ = 840320. Its totient is φ = 840318.

The previous prime is 840299. The next prime is 840331. The reversal of 840319 is 913048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840319 - 2¹⁹ = 316031 is a prime.

It is a super-2 number, since 2×840319² = 1412272043522, which contains 22 as substring.

It is equal to p₆₆₉₁₃ and since 840319 and 66913 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 840293 and 840302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (810319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420159 + 420160.

It is an arithmetic number, because the mean of its divisors is an integer number (420160).

2⁸⁴⁰³¹⁹ is an apocalyptic number.

840319 is a deficient number, since it is larger than the sum of its proper divisors (1).

840319 is an equidigital number, since it uses as much as digits as its factorization.

840319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 840319 is about 916.6891512394. The cubic root of 840319 is about 94.3658220977.

The spelling of 840319 in words is "eight hundred forty thousand, three hundred nineteen".