420340540 has 12 divisors (see below), whose sum is σ = 882715176. Its totient is φ = 168136208.

The previous prime is 420340537. The next prime is 420340549. The reversal of 420340540 is 45043024.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420340549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10508494 + ... + 10508533.

It is an arithmetic number, because the mean of its divisors is an integer number (73559598).

Almost surely, 2^420340540 is an apocalyptic number.

It is an amenable number.

420340540 is an abundant number, since it is smaller than the sum of its proper divisors (462374636).

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

420340540 is a wasteful number, since it uses less digits than its factorization.

420340540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21017036 (or 21017034 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 420340540 is about 20502.2081737553. The cubic root of 420340540 is about 749.0895856786.

Adding to 420340540 its reverse (45043024), we get a palindrome (465383564).

The spelling of 420340540 in words is "four hundred twenty million, three hundred forty thousand, five hundred forty".