857689509 has 8 divisors (see below), whose sum is σ = 1144810240. Its totient is φ = 571180896.

The previous prime is 857689453. The next prime is 857689523. The reversal of 857689509 is 905986758.

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

It is not a de Polignac number, because 857689509 - 2¹³ = 857681317 is a prime.

It is a super-2 number, since 2×857689509² = 1471262587697322162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857689109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149749 + ... + 155370.

It is an arithmetic number, because the mean of its divisors is an integer number (143101280).

Almost surely, 2^857689509 is an apocalyptic number.

It is an amenable number.

857689509 is a deficient number, since it is larger than the sum of its proper divisors (287120731).

857689509 is a wasteful number, since it uses less digits than its factorization.

857689509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306059.

The product of its (nonzero) digits is 5443200, while the sum is 57.

The square root of 857689509 is about 29286.3365581972. The cubic root of 857689509 is about 950.1161479413.

The spelling of 857689509 in words is "eight hundred fifty-seven million, six hundred eighty-nine thousand, five hundred nine".