842709 has 8 divisors (see below), whose sum is σ = 1284160. Its totient is φ = 481536.

The previous prime is 842701. The next prime is 842729. The reversal of 842709 is 907248.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 842709 - 2³ = 842701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842701) 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 in 7 ways as a sum of consecutive naturals, for example, 20044 + ... + 20085.

It is an arithmetic number, because the mean of its divisors is an integer number (160520).

2⁸⁴²⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

842709 is a deficient number, since it is larger than the sum of its proper divisors (441451).

842709 is a wasteful number, since it uses less digits than its factorization.

842709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40139.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 842709 is about 917.9918300290. The cubic root of 842709 is about 94.4552011841.

It can be divided in two parts, 842 and 709, that added together give a palindrome (1551).

The spelling of 842709 in words is "eight hundred forty-two thousand, seven hundred nine".