785590409 has 4 divisors (see below), whose sum is σ = 785656080. Its totient is φ = 785524740.

The previous prime is 785590387. The next prime is 785590441. The reversal of 785590409 is 904095587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 785590409 - 2⁸ = 785590153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (785590459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9239 + ... + 40700.

It is an arithmetic number, because the mean of its divisors is an integer number (196414020).

Almost surely, 2^785590409 is an apocalyptic number.

It is an amenable number.

785590409 is a deficient number, since it is larger than the sum of its proper divisors (65671).

785590409 is a wasteful number, since it uses less digits than its factorization.

785590409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65670.

The product of its (nonzero) digits is 453600, while the sum is 47.

The square root of 785590409 is about 28028.3857722845. The cubic root of 785590409 is about 922.7103474229.

The spelling of 785590409 in words is "seven hundred eighty-five million, five hundred ninety thousand, four hundred nine".