840494 has 8 divisors (see below), whose sum is σ = 1272240. Its totient is φ = 416416.

The previous prime is 840491. The next prime is 840523. The reversal of 840494 is 494048.

It is a happy number.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840491) 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, 1634 + ... + 2085.

It is an arithmetic number, because the mean of its divisors is an integer number (159030).

2⁸⁴⁰⁴⁹⁴ is an apocalyptic number.

840494 is a deficient number, since it is larger than the sum of its proper divisors (431746).

840494 is a wasteful number, since it uses less digits than its factorization.

840494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3834.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 840494 is about 916.7845984745. The cubic root of 840494 is about 94.3723723374.

The spelling of 840494 in words is "eight hundred forty thousand, four hundred ninety-four".