840117 has 8 divisors (see below), whose sum is σ = 1132096. Its totient is φ = 554112.

The previous prime is 840109. The next prime is 840137. The reversal of 840117 is 711048.

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

It is not a de Polignac number, because 840117 - 2³ = 840109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 840093 and 840102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1153 + ... + 1734.

It is an arithmetic number, because the mean of its divisors is an integer number (141512).

2⁸⁴⁰¹¹⁷ is an apocalyptic number.

It is an amenable number.

840117 is a deficient number, since it is larger than the sum of its proper divisors (291979).

840117 is a wasteful number, since it uses less digits than its factorization.

840117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2987.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 840117 is about 916.5789655016. The cubic root of 840117 is about 94.3582601188.

The spelling of 840117 in words is "eight hundred forty thousand, one hundred seventeen".