84043440 has 320 divisors, whose sum is σ = 323729280. Its totient is φ = 19906560.

The previous prime is 84043423. The next prime is 84043489. The reversal of 84043440 is 4434048.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1151244 + ... + 1151316.

It is an arithmetic number, because the mean of its divisors is an integer number (1011654).

Almost surely, 2^84043440 is an apocalyptic number.

84043440 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 84043440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161864640).

84043440 is an abundant number, since it is smaller than the sum of its proper divisors (239685840).

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

84043440 is a wasteful number, since it uses less digits than its factorization.

84043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 137 counting only the distinct ones).

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

The square root of 84043440 is about 9167.5209298916. The cubic root of 84043440 is about 438.0273955467.

Adding to 84043440 its reverse (4434048), we get a palindrome (88477488).

The spelling of 84043440 in words is "eighty-four million, forty-three thousand, four hundred forty".