420643530 has 80 divisors (see below), whose sum is σ = 1134232704. Its totient is φ = 111857760.

The previous prime is 420643519. The next prime is 420643537. The reversal of 420643530 is 35346024.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 420643494 and 420643503.

It is not an unprimeable number, because it can be changed into a prime (420643537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 510699 + ... + 511521.

Almost surely, 2^420643530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420643530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (567116352).

420643530 is an abundant number, since it is smaller than the sum of its proper divisors (713589174).

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

420643530 is a wasteful number, since it uses less digits than its factorization.

420643530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473 (or 1464 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 420643530 is about 20509.5960467290. The cubic root of 420643530 is about 749.2695287800.

Adding to 420643530 its reverse (35346024), we get a palindrome (455989554).

The spelling of 420643530 in words is "four hundred twenty million, six hundred forty-three thousand, five hundred thirty".