840529980 has 384 divisors, whose sum is σ = 2999808000. Its totient is φ = 194088960.

The previous prime is 840529969. The next prime is 840529981. The reversal of 840529980 is 89925048.

840529980 is a `hidden beast` number, since 8 + 40 + 529 + 9 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840529981) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10639581 + ... + 10639659.

It is an arithmetic number, because the mean of its divisors is an integer number (7812000).

Almost surely, 2^840529980 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 840529980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1499904000).

840529980 is an abundant number, since it is smaller than the sum of its proper divisors (2159278020).

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

840529980 is a wasteful number, since it uses less digits than its factorization.

840529980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 840529980 is about 28991.8950743134. The cubic root of 840529980 is about 943.7371895400.

The spelling of 840529980 in words is "eight hundred forty million, five hundred twenty-nine thousand, nine hundred eighty".