785034809 has 16 divisors (see below), whose sum is σ = 869673168. Its totient is φ = 703924992.

The previous prime is 785034763. The next prime is 785034853. The reversal of 785034809 is 908430587.

It can be written as a sum of positive squares in 8 ways, for example, as 4000000 + 781034809 = 2000^2 + 27947^2 .

It is a cyclic number.

It is not a de Polignac number, because 785034809 - 2¹² = 785030713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 785034809.

It is not an unprimeable number, because it can be changed into a prime (785034869) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 478739 + ... + 480375.

It is an arithmetic number, because the mean of its divisors is an integer number (54354573).

Almost surely, 2^785034809 is an apocalyptic number.

It is an amenable number.

785034809 is a deficient number, since it is larger than the sum of its proper divisors (84638359).

785034809 is a wasteful number, since it uses less digits than its factorization.

785034809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 785034809 is about 28018.4726386004. The cubic root of 785034809 is about 922.4927706094.

The spelling of 785034809 in words is "seven hundred eighty-five million, thirty-four thousand, eight hundred nine".