420128340 has 96 divisors (see below), whose sum is σ = 1221233664. Its totient is φ = 107827200.

The previous prime is 420128339. The next prime is 420128351. The reversal of 420128340 is 43821024.

It is a self number, because there is not a number n which added to its sum of digits gives 420128340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 214365 + ... + 216315.

It is an arithmetic number, because the mean of its divisors is an integer number (12721184).

Almost surely, 2^420128340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420128340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (610616832).

420128340 is an abundant number, since it is smaller than the sum of its proper divisors (801105324).

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

420128340 is a wasteful number, since it uses less digits than its factorization.

420128340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097 (or 2095 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 420128340 is about 20497.0324681404. The cubic root of 420128340 is about 748.9635104680.

Adding to 420128340 its reverse (43821024), we get a palindrome (463949364).

The spelling of 420128340 in words is "four hundred twenty million, one hundred twenty-eight thousand, three hundred forty".