840395 has 8 divisors (see below), whose sum is σ = 1067904. Its totient is φ = 632704.

The previous prime is 840353. The next prime is 840439. The reversal of 840395 is 593048.

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

It is a cyclic number.

It is not a de Polignac number, because 840395 - 2⁶ = 840331 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

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 7 ways as a sum of consecutive naturals, for example, 4859 + ... + 5028.

It is an arithmetic number, because the mean of its divisors is an integer number (133488).

2⁸⁴⁰³⁹⁵ is an apocalyptic number.

840395 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

840395 is a deficient number, since it is larger than the sum of its proper divisors (227509).

840395 is a wasteful number, since it uses less digits than its factorization.

840395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9909.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 840395 is about 916.7306038308. The cubic root of 840395 is about 94.3686668849.

The spelling of 840395 in words is "eight hundred forty thousand, three hundred ninety-five".