800421840 has 120 divisors (see below), whose sum is σ = 2693265120. Its totient is φ = 213034752.

The previous prime is 800421833. The next prime is 800421889. The reversal of 800421840 is 48124008.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 635131 + ... + 636389.

It is an arithmetic number, because the mean of its divisors is an integer number (22443876).

Almost surely, 2^800421840 is an apocalyptic number.

800421840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 800421840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346632560).

800421840 is an abundant number, since it is smaller than the sum of its proper divisors (1892843280).

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

800421840 is a wasteful number, since it uses less digits than its factorization.

800421840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161 (or 2152 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 800421840 is about 28291.7274127968. The cubic root of 800421840 is about 928.4809053710.

Adding to 800421840 its reverse (48124008), we get a palindrome (848545848).

The spelling of 800421840 in words is "eight hundred million, four hundred twenty-one thousand, eight hundred forty".