420540645 has 64 divisors (see below), whose sum is σ = 833310720. Its totient is φ = 176698368.

The previous prime is 420540641. The next prime is 420540697. The reversal of 420540645 is 546045024.

It is not a de Polignac number, because 420540645 - 2² = 420540641 is a prime.

It is a super-3 number, since 3×420540645³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420540641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 74016 + ... + 79494.

It is an arithmetic number, because the mean of its divisors is an integer number (13020480).

Almost surely, 2^420540645 is an apocalyptic number.

It is an amenable number.

420540645 is a deficient number, since it is larger than the sum of its proper divisors (412770075).

420540645 is a wasteful number, since it uses less digits than its factorization.

420540645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554.

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 420540645 is about 20507.0876771910. The cubic root of 420540645 is about 749.2084359735.

Adding to 420540645 its reverse (546045024), we get a palindrome (966585669).

It can be divided in two parts, 4205 and 40645, that added together give a triangular number (44850 = T₂₉₉).

The spelling of 420540645 in words is "four hundred twenty million, five hundred forty thousand, six hundred forty-five".