84403440 has 120 divisors (see below), whose sum is σ = 309252528. Its totient is φ = 20459520.

The previous prime is 84403439. The next prime is 84403481. The reversal of 84403440 is 4430448.

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 (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2592 + ... + 13248.

Almost surely, 2^84403440 is an apocalyptic number.

84403440 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 84403440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154626264).

84403440 is an abundant number, since it is smaller than the sum of its proper divisors (224849088).

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

84403440 is a wasteful number, since it uses less digits than its factorization.

84403440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10687 (or 10678 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 84403440 is about 9187.1344825250. The cubic root of 84403440 is about 438.6519346418.

Adding to 84403440 its reverse (4430448), we get a palindrome (88833888).

The spelling of 84403440 in words is "eighty-four million, four hundred three thousand, four hundred forty".