840426 has 8 divisors (see below), whose sum is σ = 1680864. Its totient is φ = 280140.

The previous prime is 840353. The next prime is 840439. The reversal of 840426 is 624048.

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

840426 is an admirable number.

It is a super-2 number, since 2×840426² = 1412631722952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840396 and 840405.

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, 70030 + ... + 70041.

It is an arithmetic number, because the mean of its divisors is an integer number (210108).

2⁸⁴⁰⁴²⁶ is an apocalyptic number.

840426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840426 is a wasteful number, since it uses less digits than its factorization.

840426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140076.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 840426 is about 916.7475115865. The cubic root of 840426 is about 94.3698272094.

It can be divided in two parts, 84042 and 6, that added together give a palindrome (84048).

The spelling of 840426 in words is "eight hundred forty thousand, four hundred twenty-six".