842731 has 4 divisors (see below), whose sum is σ = 848464. Its totient is φ = 837000.

The previous prime is 842729. The next prime is 842747. The reversal of 842731 is 137248.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 842731 - 2¹ = 842729 is a prime.

It is a super-2 number, since 2×842731² = 1420391076722, which contains 22 as substring.

It is a d-powerful number, because it can be written as 8³ + 4⁷ + 7⁷ + 2¹¹ + 3⁵ + 1 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 842696 and 842705.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2640 + ... + 2941.

It is an arithmetic number, because the mean of its divisors is an integer number (212116).

2⁸⁴²⁷³¹ is an apocalyptic number.

842731 is a deficient number, since it is larger than the sum of its proper divisors (5733).

842731 is a wasteful number, since it uses less digits than its factorization.

842731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5732.

The product of its digits is 1344, while the sum is 25.

The square root of 842731 is about 918.0038126282. The cubic root of 842731 is about 94.4560231351.

Adding to 842731 its reverse (137248), we get a palindrome (979979).

The spelling of 842731 in words is "eight hundred forty-two thousand, seven hundred thirty-one".