420216172 has 12 divisors (see below), whose sum is σ = 747842760. Its totient is φ = 206546816.

The previous prime is 420216133. The next prime is 420216227. The reversal of 420216172 is 271612024.

It is an unprimeable number.

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, 890053 + ... + 890524.

It is an arithmetic number, because the mean of its divisors is an integer number (62320230).

Almost surely, 2^420216172 is an apocalyptic number.

It is an amenable number.

420216172 is a deficient number, since it is larger than the sum of its proper divisors (327626588).

420216172 is a wasteful number, since it uses less digits than its factorization.

420216172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780640 (or 1780638 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 420216172 is about 20499.1749102250. The cubic root of 420216172 is about 749.0156995835.

Adding to 420216172 its reverse (271612024), we get a palindrome (691828196).

The spelling of 420216172 in words is "four hundred twenty million, two hundred sixteen thousand, one hundred seventy-two".