840430 has 16 divisors (see below), whose sum is σ = 1523520. Its totient is φ = 333792.

The previous prime is 840353. The next prime is 840439. The reversal of 840430 is 34048.

It is a junction number, because it is equal to n+sod(n) for n = 840398 and 840407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840439) by changing a digit.

840430 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2107 + ... + 2473.

It is an arithmetic number, because the mean of its divisors is an integer number (95220).

2⁸⁴⁰⁴³⁰ is an apocalyptic number.

840430 is a deficient number, since it is larger than the sum of its proper divisors (683090).

840430 is a wasteful number, since it uses less digits than its factorization.

840430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603.

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

The square root of 840430 is about 916.7496932097. The cubic root of 840430 is about 94.3699769266.

Adding to 840430 its reverse (34048), we get a palindrome (874478).

The spelling of 840430 in words is "eight hundred forty thousand, four hundred thirty".