840422 has 8 divisors (see below), whose sum is σ = 1375272. Its totient is φ = 382000.

The previous prime is 840353. The next prime is 840439. The reversal of 840422 is 224048.

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

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 840394 and 840403.

It is a congruent number.

It is an unprimeable number.

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, 19079 + ... + 19122.

It is an arithmetic number, because the mean of its divisors is an integer number (171909).

2⁸⁴⁰⁴²² is an apocalyptic number.

840422 is a deficient number, since it is larger than the sum of its proper divisors (534850).

840422 is a wasteful number, since it uses less digits than its factorization.

840422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38214.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 840422 is about 916.7453299581. The cubic root of 840422 is about 94.3696774917.

The spelling of 840422 in words is "eight hundred forty thousand, four hundred twenty-two".