84421040 has 160 divisors (see below), whose sum is σ = 230985216. Its totient is φ = 28385280.

The previous prime is 84421037. The next prime is 84421061. The reversal of 84421040 is 4012448.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 84420997 and 84421015.

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, 870272 + ... + 870368.

Almost surely, 2^84421040 is an apocalyptic number.

84421040 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 84421040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115492608).

84421040 is an abundant number, since it is smaller than the sum of its proper divisors (146564176).

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

84421040 is a wasteful number, since it uses less digits than its factorization.

84421040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 84421040 is about 9188.0922938334. The cubic root of 84421040 is about 438.6824220938.

Adding to 84421040 its reverse (4012448), we get a palindrome (88433488).

It can be divided in two parts, 84 and 421040, that added together give a palindrome (421124).

The spelling of 84421040 in words is "eighty-four million, four hundred twenty-one thousand, forty".