7857142857 has 8 divisors (see below), whose sum is σ = 11640211680. Its totient is φ = 5238095220.

The previous prime is 7857142831. The next prime is 7857142877. The reversal of 7857142857 is 7582417587.

It is not a de Polignac number, because 7857142857 - 2¹⁵ = 7857110089 is a prime.

It is a super-2 number, since 2×7857142857² (a number of 21 digits) contains 22 as substring.

7857142857 is a modest number, since divided by 142857 gives 7857 as remainder.

It is not an unprimeable number, because it can be changed into a prime (7857142877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145502619 + ... + 145502672.

It is an arithmetic number, because the mean of its divisors is an integer number (1455026460).

Almost surely, 2^7857142857 is an apocalyptic number.

It is an amenable number.

7857142857 is a deficient number, since it is larger than the sum of its proper divisors (3783068823).

7857142857 is a wasteful number, since it uses less digits than its factorization.

7857142857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291005300 (or 291005294 counting only the distinct ones).

The product of its digits is 4390400, while the sum is 54.

The square root of 7857142857 is about 88640.5260419860. The cubic root of 7857142857 is about 1988.0236649322.

The spelling of 7857142857 in words is "seven billion, eight hundred fifty-seven million, one hundred forty-two thousand, eight hundred fifty-seven".