785985409 has 8 divisors (see below), whose sum is σ = 858759552. Its totient is φ = 713431440.

The previous prime is 785985401. The next prime is 785985443. The reversal of 785985409 is 904589587.

785985409 = 8448² + 8449² + ... + 8458².

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

It is a cyclic number.

It is not a de Polignac number, because 785985409 - 2³ = 785985401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 785985409.

It is not an unprimeable number, because it can be changed into a prime (785985401) 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, 47529 + ... + 61894.

It is an arithmetic number, because the mean of its divisors is an integer number (107344944).

Almost surely, 2^785985409 is an apocalyptic number.

It is an amenable number.

785985409 is a deficient number, since it is larger than the sum of its proper divisors (72774143).

785985409 is a wasteful number, since it uses less digits than its factorization.

785985409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110087.

The product of its (nonzero) digits is 3628800, while the sum is 55.

The square root of 785985409 is about 28035.4313146775. The cubic root of 785985409 is about 922.8649697783.

The spelling of 785985409 in words is "seven hundred eighty-five million, nine hundred eighty-five thousand, four hundred nine".