1000798785 has 36 divisors (see below), whose sum is σ = 2017941588. Its totient is φ = 457507008.

The previous prime is 1000798763. The next prime is 1000798819. The reversal of 1000798785 is 5878970001.

It can be written as a sum of positive squares in 2 ways, for example, as 443649969 + 557148816 = 21063^2 + 23604^2 .

It is not a de Polignac number, because 1000798785 - 2⁹ = 1000798273 is a prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1000798785.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 224734 + ... + 229143.

It is an arithmetic number, because the mean of its divisors is an integer number (56053933).

Almost surely, 2^1000798785 is an apocalyptic number.

1000798785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1000798785 is an abundant number, since it is smaller than the sum of its proper divisors (1017142803).

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

1000798785 is a wasteful number, since it uses less digits than its factorization.

1000798785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453902 (or 453892 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 1000798785 is about 31635.4039803509. The cubic root of 1000798785 is about 1000.2661908028.

The spelling of 1000798785 in words is "one billion, seven hundred ninety-eight thousand, seven hundred eighty-five".