421540 has 24 divisors (see below), whose sum is σ = 1012032. Its totient is φ = 144480.

The previous prime is 421517. The next prime is 421559. The reversal of 421540 is 45124.

421540 is nontrivially palindromic in base 9.

421540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1366 + ... + 1645.

It is an arithmetic number, because the mean of its divisors is an integer number (42168).

2⁴²¹⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

421540 is an abundant number, since it is smaller than the sum of its proper divisors (590492).

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

421540 is a wasteful number, since it uses less digits than its factorization.

421540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027 (or 3025 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 421540 is about 649.2611185032. The cubic root of 421540 is about 74.9801428912.

Adding to 421540 its reverse (45124), we get a palindrome (466664).

It can be divided in two parts, 421 and 540, that added together give a square (961 = 31²).

The spelling of 421540 in words is "four hundred twenty-one thousand, five hundred forty".