840122 has 8 divisors (see below), whose sum is σ = 1294356. Its totient is φ = 408672.

The previous prime is 840109. The next prime is 840137. The reversal of 840122 is 221048.

It can be written as a sum of positive squares in 2 ways, for example, as 829921 + 10201 = 911^2 + 101^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 840122.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840122.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5603 + ... + 5750.

2⁸⁴⁰¹²² is an apocalyptic number.

840122 is a deficient number, since it is larger than the sum of its proper divisors (454234).

840122 is a wasteful number, since it uses less digits than its factorization.

840122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11392.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 840122 is about 916.5816930312. The cubic root of 840122 is about 94.3584473111.

The spelling of 840122 in words is "eight hundred forty thousand, one hundred twenty-two".