842399 has 2 divisors, whose sum is σ = 842400. Its totient is φ = 842398.

The previous prime is 842393. The next prime is 842407. The reversal of 842399 is 993248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 842399 - 2⁴ = 842383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842393) 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, 421199 + 421200.

It is an arithmetic number, because the mean of its divisors is an integer number (421200).

2⁸⁴²³⁹⁹ is an apocalyptic number.

842399 is a deficient number, since it is larger than the sum of its proper divisors (1).

842399 is an equidigital number, since it uses as much as digits as its factorization.

842399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 842399 is about 917.8229676795. The cubic root of 842399 is about 94.4436176270.

It can be divided in two parts, 84239 and 9, that added together give a palindrome (84248).

The spelling of 842399 in words is "eight hundred forty-two thousand, three hundred ninety-nine".