840440080 has 80 divisors (see below), whose sum is σ = 1999961280. Its totient is φ = 328333824.

The previous prime is 840440077. The next prime is 840440131. The reversal of 840440080 is 80044048.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1606699 + ... + 1607221.

It is an arithmetic number, because the mean of its divisors is an integer number (24999516).

Almost surely, 2^840440080 is an apocalyptic number.

840440080 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 840440080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999980640).

840440080 is an abundant number, since it is smaller than the sum of its proper divisors (1159521200).

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

840440080 is a wasteful number, since it uses less digits than its factorization.

840440080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968 (or 962 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 840440080 is about 28990.3445995387. The cubic root of 840440080 is about 943.7035421190.

It can be divided in two parts, 8404 and 40080, that added together give a palindrome (48484).

The spelling of 840440080 in words is "eight hundred forty million, four hundred forty thousand, eighty".