840403 has 4 divisors (see below), whose sum is σ = 842688. Its totient is φ = 838120.

The previous prime is 840353. The next prime is 840439. The reversal of 840403 is 304048.

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 840403 - 2¹³ = 832211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840473) 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, 451 + ... + 1372.

It is an arithmetic number, because the mean of its divisors is an integer number (210672).

2⁸⁴⁰⁴⁰³ is an apocalyptic number.

840403 is a deficient number, since it is larger than the sum of its proper divisors (2285).

840403 is a wasteful number, since it uses less digits than its factorization.

840403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 840403 is about 916.7349671524. The cubic root of 840403 is about 94.3689663262.

The spelling of 840403 in words is "eight hundred forty thousand, four hundred three".