918521856 has 360 divisors, whose sum is σ = 3219726510. Its totient is φ = 260112384.

The previous prime is 918521833. The next prime is 918521867. The reversal of 918521856 is 658125819.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 914457600 + 4064256 = 30240^2 + 2016^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 8128456 + ... + 8128568.

Almost surely, 2^918521856 is an apocalyptic number.

918521856 is a gapful number since it is divisible by the number (96) 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 918521856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1609863255).

918521856 is an abundant number, since it is smaller than the sum of its proper divisors (2301204654).

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

918521856 is a wasteful number, since it uses less digits than its factorization.

918521856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 125 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The square root of 918521856 is about 30307.1254987998. The cubic root of 918521856 is about 972.0676678999.

The spelling of 918521856 in words is "nine hundred eighteen million, five hundred twenty-one thousand, eight hundred fifty-six".