840996520 has 256 divisors, whose sum is σ = 2496614400. Its totient is φ = 247726080.

The previous prime is 840996479. The next prime is 840996539. The reversal of 840996520 is 25699048.

It is a super-2 number, since 2×840996520² = 1414550293304220800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3272232 + ... + 3272488.

It is an arithmetic number, because the mean of its divisors is an integer number (9752400).

Almost surely, 2^840996520 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 840996520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1248307200).

840996520 is an abundant number, since it is smaller than the sum of its proper divisors (1655617880).

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

840996520 is a wasteful number, since it uses less digits than its factorization.

840996520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 840996520 is about 28999.9399999379. The cubic root of 840996520 is about 943.9117657884.

The spelling of 840996520 in words is "eight hundred forty million, nine hundred ninety-six thousand, five hundred twenty".