420540140 has 12 divisors (see below), whose sum is σ = 883134336. Its totient is φ = 168216048.

The previous prime is 420540121. The next prime is 420540143. The reversal of 420540140 is 41045024.

420540140 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 21027007 = 420540140 / (4 + 2 + 0 + 5 + 4 + 0 + 1 + 4 + 0).

It is not an unprimeable number, because it can be changed into a prime (420540143) 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, 10513484 + ... + 10513523.

It is an arithmetic number, because the mean of its divisors is an integer number (73594528).

Almost surely, 2^420540140 is an apocalyptic number.

It is an amenable number.

420540140 is an abundant number, since it is smaller than the sum of its proper divisors (462594196).

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

420540140 is a wasteful number, since it uses less digits than its factorization.

420540140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21027016 (or 21027014 counting only the distinct ones).

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

The square root of 420540140 is about 20507.0753643712. The cubic root of 420540140 is about 749.2081360815.

Adding to 420540140 its reverse (41045024), we get a palindrome (461585164).

The spelling of 420540140 in words is "four hundred twenty million, five hundred forty thousand, one hundred forty".