424640 has 28 divisors (see below), whose sum is σ = 1011936. Its totient is φ = 169728.

The previous prime is 424639. The next prime is 424661. The reversal of 424640 is 46424.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344 + ... + 983.

2⁴²⁴⁶⁴⁰ is an apocalyptic number.

424640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

424640 is an abundant number, since it is smaller than the sum of its proper divisors (587296).

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

424640 is a wasteful number, since it uses less digits than its factorization.

424640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344 (or 1334 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 424640 is about 651.6440746297. The cubic root of 424640 is about 75.1634951839.

The spelling of 424640 in words is "four hundred twenty-four thousand, six hundred forty".