785640853 has 4 divisors (see below), whose sum is σ = 785812608. Its totient is φ = 785469100.

The previous prime is 785640847. The next prime is 785640881. The reversal of 785640853 is 358046587.

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.

It is a cyclic number.

It is not a de Polignac number, because 785640853 - 2⁹ = 785640341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (785640883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78823 + ... + 88228.

It is an arithmetic number, because the mean of its divisors is an integer number (196453152).

Almost surely, 2^785640853 is an apocalyptic number.

It is an amenable number.

785640853 is a deficient number, since it is larger than the sum of its proper divisors (171755).

785640853 is a wasteful number, since it uses less digits than its factorization.

785640853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171754.

The product of its (nonzero) digits is 806400, while the sum is 46.

The square root of 785640853 is about 28029.2856312822. The cubic root of 785640853 is about 922.7300965628.

The spelling of 785640853 in words is "seven hundred eighty-five million, six hundred forty thousand, eight hundred fifty-three".