424840 has 64 divisors (see below), whose sum is σ = 1108800. Its totient is φ = 145152.

The previous prime is 424829. The next prime is 424841. The reversal of 424840 is 48424.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9859 + ... + 9901.

It is an arithmetic number, because the mean of its divisors is an integer number (17325).

2⁴²⁴⁸⁴⁰ is an apocalyptic number.

424840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 424840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (554400).

424840 is an abundant number, since it is smaller than the sum of its proper divisors (683960).

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

424840 is a wasteful number, since it uses less digits than its factorization.

424840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 424840 is about 651.7975145703. The cubic root of 424840 is about 75.1752936795.

The spelling of 424840 in words is "four hundred twenty-four thousand, eight hundred forty".