420404210 has 8 divisors (see below), whose sum is σ = 756727596. Its totient is φ = 168161680.

The previous prime is 420404191. The next prime is 420404219. The reversal of 420404210 is 12404024.

It can be written as a sum of positive squares in 2 ways, for example, as 408161209 + 12243001 = 20203^2 + 3499^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (420404219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21020201 + ... + 21020220.

Almost surely, 2^420404210 is an apocalyptic number.

420404210 is a deficient number, since it is larger than the sum of its proper divisors (336323386).

420404210 is a wasteful number, since it uses less digits than its factorization.

420404210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42040428.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 420404210 is about 20503.7608745323. The cubic root of 420404210 is about 749.1274059072.

Adding to 420404210 its reverse (12404024), we get a palindrome (432808234).

The spelling of 420404210 in words is "four hundred twenty million, four hundred four thousand, two hundred ten".