420840408 has 32 divisors (see below), whose sum is σ = 1060392960. Its totient is φ = 139174560.

The previous prime is 420840391. The next prime is 420840419. The reversal of 420840408 is 804048024.

It is a congruent number.

It is an unprimeable number.

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, 65988 + ... + 72083.

It is an arithmetic number, because the mean of its divisors is an integer number (33137280).

Almost surely, 2^420840408 is an apocalyptic number.

It is an amenable number.

420840408 is an abundant number, since it is smaller than the sum of its proper divisors (639552552).

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

420840408 is a wasteful number, since it uses less digits than its factorization.

420840408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138207 (or 138203 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 420840408 is about 20514.3951409736. The cubic root of 420840408 is about 749.3864065855.

The spelling of 420840408 in words is "four hundred twenty million, eight hundred forty thousand, four hundred eight".