421924 has 12 divisors (see below), whose sum is σ = 742924. Its totient is φ = 209664.

The previous prime is 421913. The next prime is 421943. The reversal of 421924 is 429124.

It can be written as a sum of positive squares in 2 ways, for example, as 40000 + 381924 = 200^2 + 618^2 .

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 421895 and 421904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1084 + ... + 1420.

2⁴²¹⁹²⁴ is an apocalyptic number.

It is an amenable number.

421924 is a deficient number, since it is larger than the sum of its proper divisors (321000).

421924 is a wasteful number, since it uses less digits than its factorization.

421924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654 (or 652 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 421924 is about 649.5567719607. The cubic root of 421924 is about 75.0029035913.

Adding to 421924 its product of digits (576), we get a square (422500 = 650²).

It can be divided in two parts, 42 and 1924, that multiplied together give a palindrome (80808).

The spelling of 421924 in words is "four hundred twenty-one thousand, nine hundred twenty-four".