423521 has 8 divisors (see below), whose sum is σ = 512640. Its totient is φ = 341568.

The previous prime is 423509. The next prime is 423541. The reversal of 423521 is 125324.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 423521 - 2⁶ = 423457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 423521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1661 + ... + 1898.

It is an arithmetic number, because the mean of its divisors is an integer number (64080).

2⁴²³⁵²¹ is an apocalyptic number.

It is an amenable number.

423521 is a deficient number, since it is larger than the sum of its proper divisors (89119).

423521 is a wasteful number, since it uses less digits than its factorization.

423521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583.

The product of its digits is 240, while the sum is 17.

The square root of 423521 is about 650.7849107040. The cubic root of 423521 is about 75.0974141590.

Adding to 423521 its reverse (125324), we get a palindrome (548845).

The spelling of 423521 in words is "four hundred twenty-three thousand, five hundred twenty-one".