840982128 has 80 divisors (see below), whose sum is σ = 2492816640. Its totient is φ = 239321088.

The previous prime is 840982127. The next prime is 840982157. The reversal of 840982128 is 821289048.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 840982128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840982127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81483 + ... + 91221.

It is an arithmetic number, because the mean of its divisors is an integer number (31160208).

Almost surely, 2^840982128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840982128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1246408320).

840982128 is an abundant number, since it is smaller than the sum of its proper divisors (1651834512).

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

840982128 is a wasteful number, since it uses less digits than its factorization.

840982128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10014 (or 10008 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 840982128 is about 28999.6918604319. The cubic root of 840982128 is about 943.9063813604.

The spelling of 840982128 in words is "eight hundred forty million, nine hundred eighty-two thousand, one hundred twenty-eight".