785409 has 8 divisors (see below), whose sum is σ = 1058400. Its totient is φ = 518016.

The previous prime is 785377. The next prime is 785413. The reversal of 785409 is 904587.

785409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 785409 - 2⁵ = 785377 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 785409.

It is not an unprimeable number, because it can be changed into a prime (785459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1059 + ... + 1640.

It is an arithmetic number, because the mean of its divisors is an integer number (132300).

It is a Proth number, since it is equal to 767 ⋅ 2¹⁰ + 1 and 767 < 2¹⁰.

2⁷⁸⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

785409 is a deficient number, since it is larger than the sum of its proper divisors (272991).

785409 is a wasteful number, since it uses less digits than its factorization.

785409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 785409 is about 886.2330393299. The cubic root of 785409 is about 92.2639317683.

The spelling of 785409 in words is "seven hundred eighty-five thousand, four hundred nine".