642424 has 16 divisors (see below), whose sum is σ = 1215720. Its totient is φ = 318240.

The previous prime is 642419. The next prime is 642427. The reversal of 642424 is 424246.

642424 is a modest number, since divided by 2424 gives 64 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 642395 and 642404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642427) by changing a digit.

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, 742 + ... + 1354.

2⁶⁴²⁴²⁴ is an apocalyptic number.

It is an amenable number.

642424 is a deficient number, since it is larger than the sum of its proper divisors (573296).

642424 is a wasteful number, since it uses less digits than its factorization.

642424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 746 counting only the distinct ones).

The product of its digits is 1536, while the sum is 22.

The square root of 642424 is about 801.5135681946. The cubic root of 642424 is about 86.2860494827.

It can be divided in two parts, 64242 and 4, that added together give a palindrome (64246).

The spelling of 642424 in words is "six hundred forty-two thousand, four hundred twenty-four".