840199 has 4 divisors (see below), whose sum is σ = 884440. Its totient is φ = 795960.

The previous prime is 840197. The next prime is 840223. The reversal of 840199 is 991048.

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 840199 - 2¹ = 840197 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 840199.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22092 + ... + 22129.

It is an arithmetic number, because the mean of its divisors is an integer number (221110).

2⁸⁴⁰¹⁹⁹ is an apocalyptic number.

840199 is a deficient number, since it is larger than the sum of its proper divisors (44241).

840199 is a wasteful number, since it uses less digits than its factorization.

840199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44240.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 840199 is about 916.6236959625. The cubic root of 840199 is about 94.3613299791.

The spelling of 840199 in words is "eight hundred forty thousand, one hundred ninety-nine".