1085021784 has 256 divisors, whose sum is σ = 3805056000. Its totient is φ = 278277120.

The previous prime is 1085021783. The next prime is 1085021789. The reversal of 1085021784 is 4871205801.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1085021783) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1479882 + ... + 1480614.

It is an arithmetic number, because the mean of its divisors is an integer number (14863500).

Almost surely, 2^1085021784 is an apocalyptic number.

1085021784 is a gapful number since it is divisible by the number (14) 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 1085021784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1902528000).

1085021784 is an abundant number, since it is smaller than the sum of its proper divisors (2720034216).

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

1085021784 is a wasteful number, since it uses less digits than its factorization.

1085021784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855 (or 845 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 1085021784 is about 32939.6688507945. The cubic root of 1085021784 is about 1027.5733188663.

The spelling of 1085021784 in words is "one billion, eighty-five million, twenty-one thousand, seven hundred eighty-four".