857142889 has 4 divisors (see below), whose sum is σ = 858903424. Its totient is φ = 855382356.

The previous prime is 857142887. The next prime is 857142899. The reversal of 857142889 is 988241758.

It is a happy number.

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 857142889 - 2¹ = 857142887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857142887) 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 3 ways as a sum of consecutive naturals, for example, 879537 + ... + 880510.

It is an arithmetic number, because the mean of its divisors is an integer number (214725856).

Almost surely, 2^857142889 is an apocalyptic number.

It is an amenable number.

857142889 is a deficient number, since it is larger than the sum of its proper divisors (1760535).

857142889 is a wasteful number, since it uses less digits than its factorization.

857142889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760534.

The product of its digits is 1290240, while the sum is 52.

The square root of 857142889 is about 29277.0027325203. The cubic root of 857142889 is about 949.9142633614.

The spelling of 857142889 in words is "eight hundred fifty-seven million, one hundred forty-two thousand, eight hundred eighty-nine".