842643 has 20 divisors (see below), whose sum is σ = 1283568. Its totient is φ = 550800.

The previous prime is 842627. The next prime is 842657. The reversal of 842643 is 346248.

It is not a de Polignac number, because 842643 - 2⁴ = 842627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (842623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8130 + ... + 8232.

2⁸⁴²⁶⁴³ is an apocalyptic number.

842643 is a deficient number, since it is larger than the sum of its proper divisors (440925).

842643 is a wasteful number, since it uses less digits than its factorization.

842643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 207 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 842643 is about 917.9558812928. The cubic root of 842643 is about 94.4527352455.

It can be divided in two parts, 842 and 643, that added together give a triangular number (1485 = T₅₄).

The spelling of 842643 in words is "eight hundred forty-two thousand, six hundred forty-three".