421040540 has 24 divisors (see below), whose sum is σ = 886245360. Its totient is φ = 168023808.

The previous prime is 421040537. The next prime is 421040549. The reversal of 421040540 is 45040124.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421040549) 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, 15650 + ... + 32969.

It is an arithmetic number, because the mean of its divisors is an integer number (36926890).

Almost surely, 2^421040540 is an apocalyptic number.

It is an amenable number.

421040540 is an abundant number, since it is smaller than the sum of its proper divisors (465204820).

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

421040540 is a wasteful number, since it uses less digits than its factorization.

421040540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49061 (or 49059 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 421040540 is about 20519.2724042545. The cubic root of 421040540 is about 749.5051787929.

Adding to 421040540 its reverse (45040124), we get a palindrome (466080664).

The spelling of 421040540 in words is "four hundred twenty-one million, forty thousand, five hundred forty".