840193 has 4 divisors (see below), whose sum is σ = 867328. Its totient is φ = 813060.

The previous prime is 840187. The next prime is 840197. The reversal of 840193 is 391048.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13521 + ... + 13582.

It is an arithmetic number, because the mean of its divisors is an integer number (216832).

2⁸⁴⁰¹⁹³ is an apocalyptic number.

It is an amenable number.

840193 is a deficient number, since it is larger than the sum of its proper divisors (27135).

840193 is a wasteful number, since it uses less digits than its factorization.

840193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27134.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 840193 is about 916.6204230760. The cubic root of 840193 is about 94.3611053620.

The spelling of 840193 in words is "eight hundred forty thousand, one hundred ninety-three".