840349 has 4 divisors (see below), whose sum is σ = 859936. Its totient is φ = 820764.

The previous prime is 840347. The next prime is 840353. The reversal of 840349 is 943048.

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 not a de Polignac number, because 840349 - 2¹ = 840347 is a prime.

It is a Duffinian number.

840349 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840341) by changing a digit.

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, 9729 + ... + 9814.

It is an arithmetic number, because the mean of its divisors is an integer number (214984).

2⁸⁴⁰³⁴⁹ is an apocalyptic number.

It is an amenable number.

840349 is a deficient number, since it is larger than the sum of its proper divisors (19587).

840349 is a wasteful number, since it uses less digits than its factorization.

840349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19586.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 840349 is about 916.7055143283. The cubic root of 840349 is about 94.3669450605.

The spelling of 840349 in words is "eight hundred forty thousand, three hundred forty-nine".