918505820 has 48 divisors (see below), whose sum is σ = 2004473856. Its totient is φ = 353160000.

The previous prime is 918505799. The next prime is 918505823. The reversal of 918505820 is 28505819.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918505823) 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, 88715 + ... + 98525.

It is an arithmetic number, because the mean of its divisors is an integer number (41759872).

Almost surely, 2^918505820 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 918505820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1002236928).

918505820 is an abundant number, since it is smaller than the sum of its proper divisors (1085968036).

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

918505820 is a wasteful number, since it uses less digits than its factorization.

918505820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10002 (or 10000 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 918505820 is about 30306.8609393979. The cubic root of 918505820 is about 972.0620109241.

The spelling of 918505820 in words is "nine hundred eighteen million, five hundred five thousand, eight hundred twenty".