785440 has 24 divisors (see below), whose sum is σ = 1855980. Its totient is φ = 314112.

The previous prime is 785431. The next prime is 785459. The reversal of 785440 is 44587.

785440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 725904 + 59536 = 852^2 + 244^2 .

It is a junction number, because it is equal to n+sod(n) for n = 785399 and 785408.

It is an unprimeable number.

785440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2295 + ... + 2614.

2⁷⁸⁵⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

785440 is an abundant number, since it is smaller than the sum of its proper divisors (1070540).

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

785440 is a wasteful number, since it uses less digits than its factorization.

785440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4924 (or 4916 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 785440 is about 886.2505289138. The cubic root of 785440 is about 92.2651456345.

It can be divided in two parts, 785 and 440, that added together give a triangular number (1225 = T₄₉).

The spelling of 785440 in words is "seven hundred eighty-five thousand, four hundred forty".