420840860 has 24 divisors (see below), whose sum is σ = 964108656. Its totient is φ = 153032960.

The previous prime is 420840859. The next prime is 420840863. The reversal of 420840860 is 68048024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420840863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 956237 + ... + 956676.

It is an arithmetic number, because the mean of its divisors is an integer number (40171194).

Almost surely, 2^420840860 is an apocalyptic number.

It is an amenable number.

420840860 is an abundant number, since it is smaller than the sum of its proper divisors (543267796).

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

420840860 is a wasteful number, since it uses less digits than its factorization.

420840860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912933 (or 1912931 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 420840860 is about 20514.4061576249. The cubic root of 420840860 is about 749.3866748761.

Adding to 420840860 its reverse (68048024), we get a palindrome (488888884).

The spelling of 420840860 in words is "four hundred twenty million, eight hundred forty thousand, eight hundred sixty".