842869 has 2 divisors, whose sum is σ = 842870. Its totient is φ = 842868.

The previous prime is 842857. The next prime is 842879. The reversal of 842869 is 968248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 702244 + 140625 = 838^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 842869 - 2¹¹ = 840821 is a prime.

It is a super-2 number, since 2×842869² = 1420856302322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421434 + 421435.

It is an arithmetic number, because the mean of its divisors is an integer number (421435).

2⁸⁴²⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

842869 is a deficient number, since it is larger than the sum of its proper divisors (1).

842869 is an equidigital number, since it uses as much as digits as its factorization.

842869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 37.

The square root of 842869 is about 918.0789726380. The cubic root of 842869 is about 94.4611786828.

It can be divided in two parts, 842 and 869, that added together give a triangular number (1711 = T₅₈).

The spelling of 842869 in words is "eight hundred forty-two thousand, eight hundred sixty-nine".