840115 has 4 divisors (see below), whose sum is σ = 1008144. Its totient is φ = 672088.

The previous prime is 840109. The next prime is 840137. The reversal of 840115 is 511048.

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 840115 - 2⁵ = 840083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 840092 and 840101.

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, 84007 + ... + 84016.

It is an arithmetic number, because the mean of its divisors is an integer number (252036).

2⁸⁴⁰¹¹⁵ is an apocalyptic number.

840115 is a deficient number, since it is larger than the sum of its proper divisors (168029).

840115 is a wasteful number, since it uses less digits than its factorization.

840115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168028.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 840115 is about 916.5778744875. The cubic root of 840115 is about 94.3581852417.

The spelling of 840115 in words is "eight hundred forty thousand, one hundred fifteen".