857742789 has 8 divisors (see below), whose sum is σ = 1143792832. Its totient is φ = 571760640.

The previous prime is 857742779. The next prime is 857742791. The reversal of 857742789 is 987247758.

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

It is not a de Polignac number, because 857742789 - 2⁵ = 857742757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857742779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37317 + ... + 55749.

It is an arithmetic number, because the mean of its divisors is an integer number (142974104).

Almost surely, 2^857742789 is an apocalyptic number.

It is an amenable number.

857742789 is a deficient number, since it is larger than the sum of its proper divisors (286050043).

857742789 is a wasteful number, since it uses less digits than its factorization.

857742789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33947.

The product of its digits is 7902720, while the sum is 57.

The square root of 857742789 is about 29287.2461832792. The cubic root of 857742789 is about 950.1358213933.

The spelling of 857742789 in words is "eight hundred fifty-seven million, seven hundred forty-two thousand, seven hundred eighty-nine".