842105 has 16 divisors (see below), whose sum is σ = 1124928. Its totient is φ = 600000.

The previous prime is 842089. The next prime is 842111. The reversal of 842105 is 501248.

It is not a de Polignac number, because 842105 - 2⁴ = 842089 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3230 + ... + 3480.

It is an arithmetic number, because the mean of its divisors is an integer number (70308).

2⁸⁴²¹⁰⁵ is an apocalyptic number.

It is an amenable number.

842105 is a deficient number, since it is larger than the sum of its proper divisors (282823).

842105 is a wasteful number, since it uses less digits than its factorization.

842105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 842105 is about 917.6627920974. The cubic root of 842105 is about 94.4326293050.

It can be divided in two parts, 842 and 105, that multiplied together give a triangular number (88410 = T₄₂₀).

The spelling of 842105 in words is "eight hundred forty-two thousand, one hundred five".