420821875 has 24 divisors (see below), whose sum is σ = 528903648. Its totient is φ = 334800000.

The previous prime is 420821873. The next prime is 420821903. The reversal of 420821875 is 578128024.

It is not a de Polignac number, because 420821875 - 2¹ = 420821873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420821873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 971659 + ... + 972091.

It is an arithmetic number, because the mean of its divisors is an integer number (22037652).

Almost surely, 2^420821875 is an apocalyptic number.

420821875 is a deficient number, since it is larger than the sum of its proper divisors (108081773).

420821875 is an frugal number, since it uses more digits than its factorization.

420821875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769 (or 749 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 420821875 is about 20513.9434287998. The cubic root of 420821875 is about 749.3754059133.

Adding to 420821875 its reverse (578128024), we get a palindrome (998949899).

The spelling of 420821875 in words is "four hundred twenty million, eight hundred twenty-one thousand, eight hundred seventy-five".